Historical Data Review for Sam Rayburn Reservoir

Table of Contents

Table of Contents ...... i 1.0 Introduction ...... 1-1 1.1 Project Overview and Objectives ...... 1-1 1.2 Watershed and Impairment Overviews ...... 1-2 1.3 TCEQ Water Quality Standards ...... 1-6 2.0 Data Inventory ...... 2-1 2.1 Geographic and Monitoring Data ...... 2-1 2.2 Additional Reports and Information ...... 2-2 3.0 Watershed Characteristics ...... 3-1 3.1 General Information ...... 3-1 3.2 Geology ...... 3-3 3.3 Soils ...... 3-3 3.4 Climate ...... 3-3 3.5 Landuse ...... 3-7 3.6 Ecological Characterization ...... 3-10 Appendix 3A ...... 3A-1 4.0 Reservoir Characteristics ...... 4-1 4.1 Hydraulics ...... 4-1 4.1.1 Reservoir Operations ...... 4-1 4.1.2 Water Surface Elevation ...... 4-2 4.2 Sam Rayburn Reservoir TRACS Water Quality Data ...... 4-4 4.2.1 TRACS Monitoring Stations at Sam Rayburn Reservoir ...... 4-6 4.2.2 Water Quality Data Analysis ...... 4-9 4.2.2.1 Dissolved Oxygen and Nutrients ...... 4-9 4.2.2.2 Metals and Dioxin ...... 4-16 4.2.2.3 Bacteria ...... 4-21 4.2.2.4 Conventional Parameters ...... 4-22 4.2.3 Impairment Summary ...... 4-25 4.3 Sam Rayburn Reservoir STORET Water Quality Data ...... 4-28 4.3.1 STORET Monitoring Stations at Sam Rayburn Reservoir ...... 4-28 4.3.2 Water Quality Data Analysis ...... 4-31 4.3.2.1 Dissolved Oxygen and Nutrients ...... 4-31 4.3.2.2 Metals and Dioxin ...... 4-34 4.3.2.3 Fecal Coliform Bacteria ...... 4-34 4.3.2.4 Conventional Parameters ...... 4-35 4.3.3 Impairment Analysis ...... 4-37 4.3.3.1 Impairment Summary (Based on STORET Data) ...... 4-37 Appendix 4A ...... 4A-1 Appendix 4B ...... 4B-1 Appendix 4C ...... 4C-1 Appendix 4D ...... 4D-1 5.0 Stream Characteristics ...... 5-1 5.1 Flow ...... 5-1 5.1.1 Monitoring Stations ...... 5-1

June 2003 i Historical Data Review for Sam Rayburn Reservoir

5.1.2 Temporal Summary ...... 5-5 5.2 TRACS Water Quality Data for Segments 0611 and 0612 ...... 5-11 5.2.1 Monitoring Stations ...... 5-11 5.2.2 Water Quality Data Analysis ...... 5-15 5.2.2.1 Dissolved Oxygen and Nutrients ...... 5-15 5.2.2.2 Metals and Dioxin ...... 5-19 5.2.2.3 Bacteria ...... 5-21 5.2.2.4 Conventional Parameters ...... 5-22 5.2.3 Impairment Summary ...... 5-24 5.3 STORET Water Quality Data for Segments 0611 and 0612 ...... 5-27 5.3.1 STORET Monitoring Stations for the Tributaries to the Sam Rayburn Reservoir ...... 5-27 5.3.2 Water Quality Data Analysis for Segment 0611 and 0612 ...... 5-30 5.3.2.1 Dissolved Oxygen and Nutrients ...... 5-30 5.3.2.2 Metals and Dioxin ...... 5-34 5.3.2.3 Bacteria ...... 5-36 5.3.2.4 Conventional Parameters ...... 5-36 5.3.3 Impairment Summary ...... 5-39 Appendix 5A ...... 5A-1 Appendix 5B ...... 5B-1 6.0 Source Assessment ...... 6-1 6.1 Nonpoint Sources ...... 6-1 6.1.1 Agriculture ...... 6-1 6.1.1.1 Crop Distribution ...... 6-3 6.1.1.2 Livestock Management ...... 6-3 6.1.1.3 Silviculture ...... 6-5 6.1.2 Urban ...... 6-7 6.1.2.1 Population Centers ...... 6-7 6.1.2.2 Landfills ...... 6-8 6.1.2.3 On Site Sewage Facilities ...... 6-8 6.2 Point Sources ...... 6-11 6.2.1 Permitted Facility Overview ...... 6-11 6.2.2 Permit Limits and Discharge Monitoring Report Data ...... 6-17 6.2.3 Permit Limits Exceedances ...... 6-18 Appendix 6 ...... 6-19 7.0 Preliminary Model Selection ...... 7-1 7.1 Selection Criteria ...... 7-1 7.1.1 Technical Criteria ...... 7-1 7.1.1.1 Physical Domain ...... 7-1 7.1.1.2 Critical Conditions ...... 7-2 7.1.1.3 Constituents ...... 7-2 7.1.1.4 Source Contributions ...... 7-3 7.1.2 Regulatory Criteria ...... 7-3 7.1.3 User Criteria ...... 7-4 7.2 Proposed Modeling Approach ...... 7-4 7.2.1 Proposed Approach ...... 7-4 7.2.2 LSPC ...... 7-5

June 2003 ii Historical Data Review for Sam Rayburn Reservoir

7.2.3 EFDC ...... 7-5 8.0 Conclusions ...... 8-1 8.1 Sam Rayburn Reservoir (Segment 0610 and 0615) ...... 8-1 8.2 Tributaries to Sam Rayburn Reservoir (Segment 0611 and 0612) ...... 8-2 9.0 References ...... 9-1

June 2003 iii Historical Data Review for Sam Rayburn Reservoir

1.0 Introduction

1.1 Project Overview and Objectives

Tetra Tech, Inc. (Tt) and its subcontractors (Tetra Tech-MFG, Angelina and Neches River Authority (ANRA), Lopez Garcia Group (LGG), and Diane Sheridan) are supporting the Texas Commission on Environmental Quality (TCEQ) in its effort to determine the Total Maximum Daily Loads (TMDLs) for the segments of Sam Rayburn Reservoir listed for aluminum, dissolved oxygen, and pH impairments. These listings are based on Texas’s 2000 and 2002 Clean Water Act section 303(d) lists of impaired waters. The Tt team is also supporting investigations of other possible pollutants impacting the reservoir.

The objectives of the project are as follows:

1. Develop information necessary for the TCEQ to determine whether the segments are meeting applicable water quality standards.

2. Develop information necessary for the TCEQ to determine whether the existing designated uses and criteria are appropriate and, if not, develop information necessary for the TCEQ to change the designated use and/or applicable criteria.

3. Develop information necessary to support modeling and assessment activities for allocating pollutant loadings for all segments where water quality standards are not being met.

4. Perform the modeling and assessment activities necessary to allocate the loadings of the constituents of concern for all segments where water quality standards are not being met.

5. Provide technical assistance to the TCEQ in the evaluation of actions necessary to achieve the recommended loading allocations for all segments where water quality standards are not being met.

6. Document, compile, and summarize technical analyses in reports to the TCEQ.

7. Provide support to the TCEQ for public participation/education.

This report, the Historical Data Review, is a summary and evaluation of the existing data available to characterize the two 303(d)-listed segments in the Sam Rayburn Reservoir, as well as the contributing tributaries. The report satisfies the first objectives of the project. The Tt team has identified key information and data sources relevant to the Sam Rayburn Reservoir and its contributing watershed. All available data and information for the watershed have been compiled, including data related to water quality, point sources, land use and land cover, land characteristics, meteorology, flow, and reservoir water levels. The information compiled in this document assesses current levels and trends of dissolved oxygen, aluminum, and pH in the reservoir and supports the comparison of current stream conditions to the applicable water quality criteria. In addition to dissolved oxygen, aluminum, and pH, other potential pollutants are evaluated, namely, nutrients, bacteria, copper, lead, zinc, arsenic, selenium, and dioxin. These additional pollutants were identified by TCEQ for impairment potential.

June 2003 1-1 Historical Data Review for Sam Rayburn Reservoir

The Historical Data Review includes in-depth review and analysis of available data, including statistical summaries of water quality data; comparisons of observed data to Texas Water Quality Standards; and maps of watershed characteristics and monitoring station locations. This report also discusses the model(s) that the Tt team recommends to study the fate and transport of constituents contributing to the dissolved oxygen, aluminum, and pH impairments.

1.2 Watershed and Impairment Overview

Sam Rayburn Reservoir (formerly McGee Reservoir) is in eastern Texas, on the Angelina River within the central portion of the Neches River Basin, approximately 10 miles northwest of Jasper, Texas. The reservoir covers portions of Angelina, Jasper, Nacogdoches, San Augustine, and Sabine Counties, and the Angelina River, Attoyac Bayou, and Ayish Bayou are its major tributaries (Figure 1-1). Sam Rayburn Reservoir includes TCEQ river segments 0610 (Sam Rayburn Reservoir) and 0615 (Angelina River/Sam Rayburn Reservoir) of the Sam Rayburn Reservoir watershed.

TCEQ river segments 0610 (Sam Rayburn Reservoir), 0611 (Angelina River above Sam Rayburn Reservoir), 0612 (Attoyac Bayou), 0613 (Lake Tyler/Lake Tyler East), and 0615 (Angelina River/Sam Rayburn Reservoir) are the major classified segments within the Sam Rayburn Reservoir watershed. Unclassified river segments 0611A (East Fork Angelina River), 0611B (La Nana Bayou), 0611C (Mud Creek), 0611D (West Mud Creek), 0611H (Ragsdale Creek), 0611Q (Lake Nacogdoches), 0615A (Paper Mill Creek), 0610A (Ayish Bayou), 0612B (Waffelow Creek), and 0612C (Pinkston Reservoir) are also within the watershed.

Both segments of the Sam Rayburn Reservoir (0610 and 0615) are on the 2000 Texas section 303(d) list. Several of the tributaries draining into the reservoir are also included on that list. Table 1-1 presents the listing information for the 2000 and Draft 2002 Texas section 303(d) lists for all of the waterbodies in the Sam Rayburn Reservoir watershed. Figure 1-2 presents the locations of the listed waterbodies in the watershed.

June 2003 1-2 Historical Data Review for Sam Rayburn Reservoir

Smith County TYLER

W . M Rusk u d County C r e e M k u d

C r er Cherokee e Riv e elina Shelby k Ang County E.F. County San A Nacogdoches n Augustine g A e County t County l t in o a y a R c i A v B

y e a i Sabine NACOGDOCHES r y s o h

u County

u LUFKIN Angelina County

Newton Sam Rayburn County Reservoir Jasper County County Boundaries Reach File, Version 1 Populated Places Sam Rayburn Reservoir Watershed

0 50 100 Miles W E

Source: S EPA's BASINS TNRIS

Figure 1-1. Location of the Sam Rayburn Reservoir Watershed

June 2003 1-3 Historical Data Review for Sam Rayburn Reservoir

Table 1-1. 2000 and Draft 2002 Section 303(d) Listing Information for Sam Rayburn Reservoir Watershed Parameters of Parameters of Segment Waterbody Concern on the Waterbody Designated Uses Concern on the ID Classificationa Draft 2002 303(d) 2000 303(d) List List

Sam Rayburn 0610 Classified • Aquatic Life • Depressed • Depressed Reservoir • Contact Recreation dissolved dissolved oxygen • General Use oxygen • Aluminum in • Fish Consumption • Aluminum water • Public Water (acute) Supply • Low and high pH

Ayish Bayou 0610A Unclassified • Aquatic Life • Bacteria • Bacteria • Contact Recreation • Fish Consumption

Angelina 0611 Classified • Aquatic Life • Bacteria • Bacteria River above • Contact Recreation Sam Rayburn • General Use Reservoir • Fish Consumption • Public Water Supply

East Fork 0611A Unclassified • Aquatic Life • Lead in water • Bacteria Angelina • Contact Recreation River • Fish Consumption

La Nana 0611B Unclassified • Aquatic Life • Bacteria • Bacteria Bayou • Contact Recreation • Fish Consumption

Mud Creek 0611C Unclassified • Aquatic Life • Bacteria • Bacteria • Contact Recreation • Fish Consumption

Attoyac 0612 Classified • Aquatic Life • Cadmium Bayou • Contact Recreation (chronic) • General Use • Lead (chronic) - • Fish Consumption • Public Water Supply

Waffelow 0612B Unclassified • Aquatic Life • Bacteria • Bacteria Creek • Contact Recreation • Fish Consumption

Angelina 0615 Classified • Aquatic Life • Depressed River/Sam • Contact Recreation dissolved oxygen Rayburn • General Use - Reservoir • Fish Consumption • Public Water Supply aClassified waterbodies are all waterbodies listed in Appendix A or D of §307.10 of the Texas Administrative Code. Unclassified waterbodies are those not specifically listed.

June 2003 1-4 Historical Data Review for Sam Rayburn Reservoir

Lake Tyler/ Lake Tyler East (0613)

Mud Creek rk o er (0611C) t F iv as R E ina ) el 1A Attoyac Bayou ng 61 A (0 (0612)

Waffelow Creek

u (612B)

o A y S n a a B g ) m e

A l a i )

R n 0 n a B

a 1 a y R 1 b 6 N i 1

( u v 0

6 ( 0 r e a n r 6 0 L u 1 R A ( 1 e b o ) s o y

e v a r e

v B o

ir h

s S i a y m A R a yb Sam Rayburn Reservoir u (0 r 6 n (0615) 1 R 0 e ) s e rv o ir Impaired Streams Impaired Lakes Reach File, Version 1 Sam Rayburn Reservoir Watershed

0 20 40 Miles

W E

Source: S TCEQ EPA's BASINS

Figure 1-2. Location of the Impaired Waterbodies in the Sam Rayburn Reservoir Watershed

June 2003 1-5 Historical Data Review for Sam Rayburn Reservoir

1.3 TCEQ Water Quality Standards

The TCEQ’s Texas Surface Water Quality Standards establish numeric and narrative goals for water quality. They also provide a basis on which TCEQ regulatory programs can establish reasonable methods to implement and attain the state’s goals for water quality (TCEQ 2003). These standards are codified in the Texas Administrative Code (TAC), Title 30, Chapter 307 (TCEQ 2000).

On July 26, 2000 the Texas Natural resource Conservation Commission (TNRCC), now TCEQ, adopted proposed amendments to the state’s existing surface water quality standards, as codified by rule in the TAC, Title 30, Chapter 307. The U.S. Environmental Protection Agency (EPA) is reviewing the final rule in consultation with the U.S. Fish and Wildlife Service. Therefore, the water quality criteria used in this study have not yet been approved by EPA but are expected to be approved in the near future.

Table 1-2 presents the water quality criteria for segments 0610, 0611, 0612, 0613, and 0615 in the Sam Rayburn Reservoir watershed (TCEQ 2000).

Several of the Texas aquatic life water quality criteria for metals are based on total hardness as

CaCO3 in milligrams per liter. Individual segment values for hardness are used when there are sufficient data. The TCEQ has derived 15th percentile hardness values for many of the state’s classified waterbodies for use in determining conservative metals criteria for a given stream segment. Table 1-3 presents the site-specific hardness values and equations for determining metals criteria for the segments in the Sam Rayburn reservoir watershed. Table 1-4 lists the values for the metals criteria calculated using the equations and hardness values presented in Table 1-3 for segments 0610, 0611, 0612, 0613, and 0615. The remaining applicable criteria for metals, including non-hardness-based criteria for metals and dioxin, are presented in Table 1-5.

Table 1-2. Site-specific Water Quality Criteria for the Sam Rayburn Reservoir Watershed Segment ID Parameter 0610 0611 0612 0613 0615 Cl-1 (mg/L) a,b 100 125 75 50 150 SO4-2 (mg/L) a,b 100 50 50 50 100 TDS (mg/L) a,b 400 250 50 50 500 DO (mg/L) 24 hour average c,d 5.0 5.0 5.0 5.0 5.0 DO (mg/L) 24 hour minimum c 3.0 3.0 3.0 3.0 3.0 DO (mg/L) grab minimum c 3.0 3.0 3.0 3.0 3.0 pH range c 6.0—8.5 6.0—8.5 6.0—8.5 6.5—9.0 6.5—9.0 Fecal coliform bacteria #/100ml a,e 200/400 200/400 200/400 200/400 200/400 E. coli #/100ml 1,f 126/394 126/394 126/394 126394 126/394 Temperature (oF; oC) a 93; 33.9 90; 32.2 90; 32.2 93; 33.9 93; 33.9 a Surface measurements typically collected at a depth of 1 foot from the water surface (TNRCC 2002). b Chloride, sulfate, and total dissolved solids criteria represent annual averages of all values that were collected when streamflow equaled or exceeded the 7-day, 2-year low-flow value established for each segment. Because of infrequent monitoring and the absence of stream flow information for many sites, all of the chloride, sulfate, and TDS values measured during the 5-year period (10-sample minimum) are averaged for all sites within the waterbody and compared to the criterion for each parameter (TNRCC 2002). c Dissolved oxygen and pH criteria apply to the entire mixed water column, or only to measurements made in the mixed surface layer if the water column is stratified. For reservoirs, the mixed surface layer is defined as the portion of the water column from the surface to the depth at which water temperature decreases by greater than 0.5°C (TNRCC 2002).

June 2003 1-6 Historical Data Review for Sam Rayburn Reservoir

d The dissolved oxygen 24-hour average is based on a 4-sample minimum (TNRCC 2002). e 200 counts/100mL is the geometric mean criterion for fecal coliform bacteria. The fecal coliform bacteria data in this study were compared to the instantaneous criterion of 400 counts/100mL. f 126 counts/100mL is the geometric mean criterion for E. coli bacteria. The E. Coli bacteria data in this study were compared to the instantaneous criterion of 394 counts/100mL.

Table 1-3. Metals Criteria Equations and Hardness Values

2 Total Hardness as CaCO3 (mg/L) for Metals Equations for Acute Equations for Chronic Each Segment (µg/L) Criteriaa Criteriaa 0610 0611 0612 0613 0615

Copper 0.960we(0.9422(ln(hardness))-1.3844) 0.960we(0.8545(ln(hardness))-1.386) (diss)

Lead 0.889we(1.273(ln(hardness))-1.460) 0.792we(1.273(ln(hardness))-4.705) 29.8 30.0 28.0 26.0 29.8 (diss)

Zinc 0.978we(0.8473(ln(hardness))+0.8604) 0.986we(0.8473(ln(hardness))+0.7614) (diss) aw in the equations indicates that a criterion is multiplied by a water-effects ratio to incorporate the effects of local water chemistry on toxicity. The water-effects ratio is equal to 1 except where sufficient data are available to establish a site-specific water-effects ratio. There are no site-specific water-effects ratios for the above metals in the Sam Rayburn Reservoir watershed. The number preceding the w in the freshwater criterion equation is an EPA conversion factor used to convert the total recoverable criterion to a dissolved criterion. Source: TCEQ 2003.

Table 1-4. Site-specific Metals Criteria Based on Hardness as CaCo3 (mg/L) Freshwater Chronic Criteria Metals Segment ID Freshwater Acute Criteria (mg/L) (mg/L) 0610 5.9 4.4 0611 5.9 4.4 Copper (dissolved) 0612 5.6 4.1 0613 5.2 3.9 0615 5.9 4.4 0610 15.5 0.5 0611 15.7 0.5 Lead (dissolved) 0612 14.4 0.5 0613 13.1 0.5 0615 15.5 0.5 0610 41.0 37.5 0611 41.2 37.7 Zinc (dissolved) 0612 38.9 35.5 0613 36.5 33.4 0615 41.0 37.5

June 2003 1-7 Historical Data Review for Sam Rayburn Reservoir

Table 1-5. Texas Water Quality Criteria for Metals and Dioxins in Freshwater

Applicable to All Segments

Parametersa Acute Chronic Human Healthb

Aluminum (dissolved) (µg/L) 991(w) — — Arsenic (dissolved) (µg/L) 360(w) 190(w) 50 Copper (dissolved) a (µg/L) See Table 1-4 See Table 1-4 — Lead (dissolved)a (µg/L) See Table 1-4 See Table 1-4 4.98 Zinc (dissolved) a (µg/L) See Table 1-4 See Table 1-4 — Selenium (total) (µg/L) 20 5 50 Dioxins (µg/L) -— — 0.000000134 a For toxic substances in water, individual surface grab samples or surface-to-bottom composite samples are evaluated (TNRCC 2002). bHuman health protection criteria for water and fish ingestion. (w) indicates that a criterion is multiplied by a water-effects ratio to incorporate the effects of local water chemistry on toxicity. The water-effects ratio is equal to 1 except where sufficient data are available to establish a site-specific water-effects ratio. A water effects ratio (WER) of 8.39 has been approved by the EPA for the mixing zone for the discharge from Abitibi Consolidated. The WER is being reviewed by the TPWD at this time. The Water Quality Standards group of TCEQ is determining if a WER for the reservoir is appropriate.

The state of Texas currently has no numerical criteria for nutrients in the Texas Surface Water Quality Standards. Nutrient controls, however, do exist in the form of narrative criteria, watershed rules, and antidegradation considerations. The TCEQ screens phosphorus, nitrogen, and chlorophyll a water quality monitoring data as a preliminary indication of areas of possible concern for the 303(d) listings of impaired waterbodies.

EPA has indicated that states must develop nutrient criteria and begin incorporating them into their water quality standards by the end of 2004. Therefore, the TCEQ staff are in the process of developing and evaluating criteria to address nutrients and eutrophication, as well as complementary approaches to control nutrients.

In the absence of numerical criteria, nutrient screening levels and reference conditions were used to compare to the water quality data available for the Sam Rayburn Reservoir watershed. Table 1-6 presents the nutrient screening levels provided in TCEQ’s Guidance for Assessing Texas Surface and Finished Drinking Water Quality Data (2002) as well as EPA’s reference conditions (USEPA 2000).

June 2003 1-8 Historical Data Review for Sam Rayburn Reservoir

Table 1-6. Texas Nutrient Screening Levels and EPA Nutrient Reference Criteria EPA Reference Criteriaa TCEQ Screening Levels Lake & Parameter Lake & Reservoir Stream Stream Reservoir TKN (mg/L) 0.459 0.44 — —

NO2+NO3 (mg/L) 0.033 0.067 0.32 2.76 TN calculated (mg/L) 0.492 0.507 — — TP (µg/L) 32.5 50 180 800 Secchi depth (meters) 1.1 — — — Chlorophyll a (µg/L), 2.834 0.566 21.4 11.6 spectrophotometric Ammonia, Total (mg/L) — — 0.106 0.17 Ortho P (mg/L) — — 0.05 0.5 a For ecoregion IX, subregion 35 (Pineywoods of Texas)

EPA’s recommended criteria for nutrients were developed to reduce and prevent eutrophocation on a national scale (USEPA 2002). Criteria are recommended for total phosphorus, total nitrogen, chlorophyll a, and some form of water clarity (e.g., Secchi depth). This information is intended to be used as a starting point for states to develop more refined, site-specific nutrient criteria. The EPA reference conditions for nutrients are the result of monitoring data from several reservoirs throughout Texas used to develop generic reservoir conditions considered to be representative of a healthy waterbody. The nutrient references are 25th percentile values for all seasons based on minimally affected surface waters for ecoregion IX, subregion 35 (Pineywoods of Texas). In general, the values EPA put forth are guideline values that the Agency believes (based on its data set) are protective of aquatic ecosystems, in that they are representative of minimally affected waters.

Note that the Texas nutrient screening levels and EPA’s reference conditions are not adopted water quality standards; they are only benchmark criteria used to indicate potential pollutant concerns.

The remainder of this Historical Data Review presents a summary and analysis of all pertinent water quality data collected in the watershed since 1990, a source assessment of point and nonpoint sources of pollutants in the watershed, and the selection of a model and modeling approach potentially to be used in developing TMDLs for the Sam Rayburn Reservoir.

June 2003 1-9 Historical Data Review for Sam Rayburn Reservoir

2.0 Data Inventory

2.1 Geographic and Monitoring Data

A wide range of data and information were reviewed for inclusion in the Historical Data Review for Sam Rayburn Reservoir. The Data Review summarizes existing data available to characterize the 303(d)-listed Sam Rayburn Reservoir and its contributing watershed and identifies recommended data sets to support potential TMDL development. Readily available data and information for the watershed were identified and in most situations compiled, including data related to water quality, point sources, land use and land cover, land characteristics, meteorology, and flow. All of these data were used to characterize the watershed and the potential pollutant sources. The information compiled in Table 2-1 was used to support the development of an Historical Data Review and comparison of current waterbody conditions to the applicable water quality criteria.

Table 2-1 is composed geographic or locational information, monitoring data, and land practices and activities.

Table 2-1. Inventory of data and information used for the source assessment of the watershed Data Category Description Data Source(s)

Land Use Coverage • USGS Multi-Resolution Land Chracteristics

Reservoir boundary and stream • EPA Better Assessment Science network Integrating point and Nonpoint Sources (BASINS) Reach File coverages (RF1, RF3) • USGS National Hydrography Dataset (NHD)

Weather Information • National Climatic Data Center (NOAA)

County boundaries, cities/towns, • EPA BASINS populated places • Texas Natural Resources Information Geographic or Locational System (TNRIS) Information Soils • County soil surveys for Smith, Cherokee, Rusk, Shelby, Nacogdoches, Angelina, San Augustine, Sabine, Newton, and Jasper Counties. • USGS STATSGO (entire state) • Physiographic Map of Texas

Watershed boundaries • Angelina and Neches River Authority (ANRA) • USGS Hydrologic Unit Boundaries (8- digit)

Topographic relief and elevation • USGS 7.5 minute Topos data • USGS Digital Elevation Models (DEM)

June 2003 2-1 Historical Data Review for Sam Rayburn Reservoir

Data Category Description Data Source(s)

Dam locations • EPA BASINS

Hazardous waste sites • ANRA Geographic or Locational Information CAFOs • ANRA Septic/Sewer spatial coverages • ANRA

303(d) Listed Waters • TCEQ

Water Quality Monitoring Data • TCEQ’s TRACS • EPA’s STORET • ANRA SWQM database

Flow Monitoring Data • USGS

Biomonitoring and habitat data • TCEQ’s TRACS

Reservoir physical data and water • U.S. Army Corps of Engineers surface levels Monitoring Data Stream channel data (for upstream • EPA BASINS Reach File coverages (RF1 tributaries) & RF3) • USGS NHD

Septic systems and illicit • ANRA OSSF Database of permitted discharges (lake proper and systems within 2,000 feet of Sam Rayburn upstream watershed) Reservoir • U.S. Census

TPDES permitted facilities • TCEQ database • EPA STORET

Livestock • USDA-NRCS Agricultural Census

Major crops, rotation, management • USDA-NRCS Agricultural Census Land Practices and Activities Timber practices • U.S. Forest Service • Texas State Soil and Water Conservation Board (TSSWCB)

2.2 Additional Reports and Information

This section contains a list of currently available reports with information pertaining to the Sam Rayburn Reservoir or the Angelina River watershed. These reports were used to help characterize the reservoir, its contributing watershed, and potential impairments to the waterbody.

Adler, P.M. 1972. A Study of Eutrophication in Upper Sam Rayburn Reservoir. M.S. Thesis, Stephen F. Austin State University, Nacogdoches, Texas.

Angelina & Neches River Authority, USGS, and University of Texas at Austin. (No date). Water Quality Assessment Protocol for Texas River Basins: A Case Study on the Upper Neches River

June 2003 2-2 Historical Data Review for Sam Rayburn Reservoir

Basin Study Area for the Clean Rivers Program-Book I Report.

Angelina & Neches River Authority, USGS, and University of Texas at Austin. (No date). Water Quality Assessment Protocol for Texas River Basins: A Case Study on the Upper Neches River Basin Study Area for the Clean Rivers Program-Book II Appendices.

Angelina & Neches River Authority, Upper Neches River Municipal Water Authority, Lower Neches Valley Authority. 1992. Consolidated Executive Summary: Regional Assessment of Water Quality Neches River Basin.

Angelina & Neches River Authority. 1994. Regional Assessment of Water Quality, Neches River Basin, Volume I, Upper Neches River Basin Study Area.

ANRA Regional Assessment of Water Quality, 1996

ANRA and SFASU. 1996. Poultry Litter Land Application Rate Study (PLLARS). (copies at ANRA)

ANRA Upper Neches Basin Summary Report, 1999

Dion, E.O. 1988. A comparison of the benthic macroinvertebrate communities of the main tributaries of Sam Rayburn Reservoir; the Angelina and Attoyac Rivers, Texas. M.S. Thesis, Stephen F.Austin State University, Nacogdoches, Texas.

EA Engineering, Science, and Technology. 1996. Site Specific Dissolved Oxygen Criteria Development for the Riverine Reach of Segment 0610. Prepared for Champion International Corporation Lufkin Mill, Lufkin Texas.

El-Hage, A. and D.W. Moulton. 1998. Evaluation of Selected Natural Resources in Angelina, Cherokee, Gregg, Nacogdoches, Rusk, and Smith Counties, Texas.

Texas Parks and Wildlife Department. 2000. 1999 Report of Sam Rayburn Task Force.

TNRCC Region 10 staff. Sediment Contaminants Study. Available from TNRCC SWQM in Austin.

TNRCC Region 10 Staff. 1998-2000. Aquatic Life Use Determinations conducted by TNRCC Region 10 staff.

TNRCC. 1998. 1998 State of Texas Reservoir Water Quality Assessment.

Tischler and Kocurek. 1996. Development of a site-specific water quality standard for Aluminum. Prepared for Champion International Paper, Lufkin, Texas.

U.S. Army Corps of Engineers. 1998. Report on Water Quality - Sam Rayburn Reservoir, Angelina River, Neches River Basin, Texas.

June 2003 2-3 Historical Data Review for Sam Rayburn Reservoir

U.S. Army Corps of Engineers, Ft. Worth District. 1998. Report on Water Quality, Sam Rayburn Reservoir.

U.S. EPA. Review of Use Attainability Analysis for Segment 0615

U.S. EPA, Texas Water Quality Board, and Texas National Guard. 1977. National Eutrophication Survey - Report on Sam Rayburn Reservoir, Angelina, Jasper, Nacogdoches, Sabine, and San Augustine Counties, Texas, Region VI, Working Paper # 657. 1977

Correspondence letters between Region 6 and TNRCC Regarding review of reclassification of Angelina River Segment 615

June 2003 2-4 Historical Data Review for Sam Rayburn Reservoir 3.0 Watershed Characteristics

3.1 General Information

Sam Rayburn Reservoir (formerly McGee Reservoir) is in eastern Texas, on the Angelina River within the central portion of the Neches River Basin. The reservoir covers portions of Angelina, Jasper, Nacogdoches, San Augustine, and Sabine Counties, and the Angelina River, Attoyac Bayou, and Ayish Bayou are its major tributaries. The U. S. Army Corps of Engineers built the reservoir and continues to own and operate it. The primary goals of the reservoir are control of floodwaters, generation of hydroelectric power, as well as water for municipal, industrial, agricultural, and recreational uses. Construction of the reservoir began in September 1956. Impoundment began on March 29, 1965, creating a conservation pool of 164.4 feet above mean sea level (msl), impounding approximately 114,500 surface acres, and creating 750 miles of shoreline. Sam Rayburn Reservoir is 43 miles long. It has a mean depth of 20 feet and a maximum depth of approximately 90 feet, with annual average water level fluctuations of 8 feet. The reservoir is almost entirely surrounded by the Angelina National Forest and to a lesser extent by the Sabine National Forest, with only a small portion of the northwestern Angelina River arm, eastern Ayish Bayou arm, and southeastern basin shorelines outside National Forest lands. Sam Rayburn Reservoir lies within TCEQ river segments 0610 (Sam Rayburn Reservoir) and 0615 (Angelina River/Sam Rayburn Reservoir) of the Angelina River watershed.

The upper portion of the Sam Rayburn Reservoir watershed lies entirely within Smith, Cherokee, Rusk, Nacogdoches, Shelby, San Augustine, Angelina, Jasper, Sabine and Newton Counties. The watershed drains approximately 886,400 acres (1,385 square miles). Cities in the Sam Rayburn Reservoir watershed with populations greater than 10,000 are Lufkin, Nacogdoches, Jacksonville, Henderson, and Tyler. Numerous less-populated cities and townships are also part of the watershed. TCEQ river segments 0610 (Sam Rayburn Reservoir), 0611 (Angelina River above Sam Rayburn Reservoir), 0612 (Attoyac Bayou), 0613 (Lake Tyler/Lake Tyler East), and 0615 (Angelina River/Sam Rayburn Reservoir) are the major classified segments within the Sam Rayburn Reservoir watershed (refer to Figure 1-1). Unclassified river segments 0611A (East Fork Angelina River), 0611B (La Nana Bayou), 0611C (Mud Creek), 0611D (West Mud Creek), 0611H (Ragsdale Creek), 0611Q (Lake Nacogdoches), 0615A (Paper Mill Creek), 0610A (Ayish Bayou), 0612B (Waffelow Creek) and 0612C (Pinkston Reservoir) are located within the watershed. Each river segment is discussed further below, beginning at the top of the watershed.

River Segment 0613: Lake Tyler/Lake Tyler East, from Whitehouse Dam and Mud Creek Dam in Smith County up to the normal pool elevation of 375.38 feet, impounding portions of Prairie Creek and Mud Creek. Segment 0613 watershed lies entirely within Smith County. The City of Tyler has owned Lake Tyler since its deliberate impoundment in 1949 (by Whitehouse Dam) as a water supply for municipal, domestic, and industrial use. The lake has a capacity of 43,400 acre-feet and a surface area of 2,450 acres at 375.5 feet above msl. In 1967 Mud Creek Dam was completed, impounding Mud Creek and forming Lake Tyler East, with a surface area of 2,530 acres at 375.4 feet above msl. In 1968 the two lakes were joined by a canal, and they have since been regarded as Lake Tyler.

June 2003 3-1 Historical Data Review for Sam Rayburn Reservoir

River Segment 0611: Angelina River above Sam Rayburn Reservoir, from the aqueduct crossing 0.6 mile upstream of the confluence of Paper Mill Creek in Angelina/Nacogdoches County to the confluence of Barnhardt Creek and Mill Creek at FM 225 in Rusk County. Unclassified river segments 0611A (East Fork Angelina River), 0611B (La Nana Bayou), 0611C (Mud Creek), 0611D (West Mud Creek), 0611H (Ragsdale Creek), and 0611Q (Lake Nacogdoches) are within the segment 0611 watershed. The Angelina River is formed by the junction of Barnhardt and Shawnee Creeks 3 miles northwest of Laneville in Rusk County. The river flows southeast for around 110 miles, forming the boundaries between Cherokee and Nacogdoches Counties, Angelina and Nacogdoches Counties, and Angelina and San Augustine Counties. The headwaters of the East Fork of the Angelina River at at the junction of Ham Creek, Double Tree Branch, and several other small streams, about 3 miles northwest of Mount Enterprise in southern Rusk County. It runs southwest for 19 miles to its mouth on the Angelina River, near the Nacogdoches county line 2 miles southeast of Reklaw.

The Mud Creek headwaters are just west of Douglas, northeast of the Chapel Hill oilfield, and northeast of Hope Pond in eastern Smith County, flowing southeast for 37 miles to its mouth on the Angelina River, 3 miles southwest of Sacul at the Cherokee/Nacogdoches county line. In Smith County impoundment of Mud Creek forms the eastern half of Lake Tyler (a.k.a. East Lake Tyler). West Mud Creek headwaters are in southeastern Tyler just west of Farm Road 2964 in central Smith County and runs southeast for 21 miles to its mouth on Mud Creek, 4 miles northeast of Mixon in Cherokee County. Lake Nacogdoches is on Bayou Loco, a tributary of the Angelina River, 10 miles west of Nacogdoches in western Nacogdoches County. Impoundment of Bayou Loco (by the Bayou Loco Dam) was completed in 1977. It created Lake Nacogdoches which has an average surface area of 42,318 acre-feet. La Nana Bayou originates approximately 8 miles north of Nacogdoches in central Nacogdoches County and flows south, through the city of Nacogdoches, for approximately 25 miles to its mouth at the Angelina River south of Climax.

River Segment 0615 Angelina River/Sam Rayburn Reservoir, originally part of Segment 0610; the riverine portion of Sam Rayburn Reservoir from a point 3.5 miles upstream of Marion’s Ferry to the aqueduct crossing 0.6 mile upstream of the confluence of Paper Mill Creek. Unclassified segment 0615A, Paper Mill Creek flows, northeast from the city of Lufkin to its mouth on the Angelina River.

River Segment 0610: Sam Rayburn Reservoir, from Sam Rayburn Dam in Jasper County to a point 3.5 miles upstream of Marion’s Ferry on the Angelina River Arm in Angelina/Nacogdoches County and to a point 2.4 miles downstream of Curry Creek on the Attoyac Bayou Arm in Nacogdoches/San Augustine County, up to normal pool elevation of 164 feet at msl. Unclassified segment 0610A (Ayish Bayou) is within the segment 0610 watershed. The headwaters of Ayish Bayou are about 7 miles north of San Augustine in northern San Augustine County, near the Shelby county line. Before the impoundment of the Angelina River and formation of Sam Rayburn Reservoir, Ayish Bayou flowed southeast for approximately 47 miles.

June 2003 3-2 Historical Data Review for Sam Rayburn Reservoir

River Segment 0612: Attoyac Bayou, from a point 2.4 miles downstream of Curry Creek in Nacogdoches and San Augustine Counties to FM 95 in Rusk County. The Attoyac Bayou watershed also includes unclassified segments 0612B (Waffelow Creek) and 0612C (Pinkston Reservoir), and it lies within Rusk, Shelby, Nacogdoches, and San Augustine Counties. The headwaters of Attoyac Bayou are one mile south of Minden School in southeastern Rusk County and flows southeast for sixty miles to its mouth at the Sam Rayburn Reservoir in Nacogdoches County forming county boundaries between Rusk and Shelby, Nacogdoches and Shelby, and Nacogdoches and San Augustine Counties. Waffelow Creek originates about 3 miles east of Appleby in central Nacogdoches County, and flows east for approximately 14 miles until its confluence with Attoyac Bayou. Pinkston Reservoir is located in southwestern Shelby County, less than one mile north of Aiken on Hwy 7.

3.2 Geology

The Sam Rayburn Reservoir watershed is wholly located within the Interior Coastal Plains physiographic subprovince of the Gulf Coastal Plains province according to the Physiographic Map of Texas (Bureau of Economic Geology 1996). The Interior Coastal Plains comprise alternating belts of resistant uncemented sand among weaker shales that erode into long, sandy ridges. At least two major down-to-the coast fault systems trend nearly parallel to the coastline. Clusters of faults also concentrate over salt domes in this region. Much of the watershed is underlain by the Eocene age Claiborne Group, including the Yegua Formation, with the exception of the southern boundaries of the watershed adjacent to Sam Rayburn Dam, which is underlain by the Oligocene-age Catahoula Formation.

3.3 Soils

The soils adjacent to the Sam Rayburn Reservoir are predominantly sand, clay and sandy clays. Alluvial soils in the reservoir area occur in narrow strips along numerous streams. Predominant upland soils are the Lufkin fine sandy loam and Susquehanna group. Bottom lands are characterized by Bibb fine sandy loam, Bibb clay, and Bibb clay loam. Soils have been developed mostly from beds of non-calcareous clay, sandy clay, clay shale, or sand. The developed soil characteristics reflect the influences of a warm moist climate.

3.4 Climate

Climate over the entire watershed is generally mild with moderate temperatures. Temperatures at or below freezing and frozen precipitation are very rare in the southern parts of the watershed, but occur occasionally in the northwestern parts. A low of -4 °F (-20 °C) and a high of 110 °F (43 °C) were recorded in Nacogdoches in 1930 and 1954, respectively. The average annual temperature recorded at Sam Rayburn Dam from 1966 to 1996 is 65.4 °F (18.5 °C). Winds prevail from the south during the spring, summer, and early fall months, with northerly winds prevailing during winter months. The observed average annual rainfall at Sam Rayburn Dam was 47.58 inches from 1968 to 2000. Average annual rainfall observed at new Summerfield from 1962 to 1996 was 37.58 inches, whereas annual rainfall at Swan was 39.33 inches for 1957 to 1996.

June 2003 3-3 Historical Data Review for Sam Rayburn Reservoir

Several meteorological stations in and around the Sam Rayburn Reservoir watershed have the potential to be used to represent weather conditions in the area for any future modeling efforts. There are three stations in the watershed itself and four nearby stations outside the watershed’s boundaries. The Nacogdoches (TX6177), New Summerfield 2W (TX6335), and Sam Rayburn Dam (TX7936) precipitation stations are inside the watershed in Nacogdoches, Cherokee, and Jasper Counties, respectively. These stations and the four stations outside the watershed boundaries contain hourly precipitation data. The four nearby stations outside the watershed are Longview 11 SE (TX5348), Lufkin Angelina County Airport (TX5424), Palestine 2 NE (TX6757), and Swan 4NW (TX8778). Three Surface Airways stations just outside the watershed contain additional meteorological data, including temperature and evapotransipiration observations. These stations are Longview WSMO (03951), Tyler Pounds Field (13972), and Lufkin Angelina County Airport (93987). Table 3-1 presents all of the stations in and near the Sam Rayburn Reservoir watershed, as well as the percent coverage for each station. The percent coverage is the percentage of days that each station has precipitation data for the period of record at the station. All of the hourly precipitation stations have data through December 2000. Figure 3-1 shows the locations of each of the meteorological stations.

Table 3-1. Meteorological Stations in or near the Sam Rayburn Reservoir Watershed Station ID Station Name County Percent Coverage

Hourly Precipitation Stations

TX6177 Nacogdoches Nacogdoches 90%

TX6335 New Summerfield 2W Cherokee 92%

TX7936 Sam Rayburn Dam Jasper 91%

TX5348 Longview 11 SE Rusk 91%

TX5424 Lufkin Angelina County Airport Angelina 100%

TX6757 Palestine 2 NE Anderson 94%

TX8778 Swann 4NW Smith 91%

Surface Airways Stations

03951 Longview WSMO Rusk N/A

13972 Tyler Pounds Field Smith N/A

93987 Lufkin Angelina County Airport Angelina N/A

June 2003 3-4 Historical Data Review for Sam Rayburn Reservoir

TYLER POUNDS FIELD LONGVIEW WSMO %U %U# LONGVIEW 11 SE

W . M u d

C M r

e u

e d k

k # NEW SUMMERFIELD 2 W

A t t o y a c

B a # y PALESTINE 2 NE o u A

n g e l i n a # R NACOGDOCHES i v e r

LUFKIN ANGELINA CTY AP %U# LUFKIN ANGELINA CO AP

Sam Rayburn # Reservoir SAM RAYBURN DAM

# Hourly Precipitation Stations %U Surface Airways Stations Reach File, Version 1 Sam Rayburn Reservoir watershed

0 40 80 Miles N

W E

S Source: NCDC EPA's BASINS

Figure 3-1. Weather Stations in and near the Sam Rayburn Reservoir Watershed.

June 2003 3-5 Historical Data Review for Sam Rayburn Reservoir

Figures 3-2 and 3-3 show the annual and monthly precipitation at the Sam Rayburn Dam (TX7936) precipitation station. As seen from figure 3-2 the average annual rainfall for the last 33 years was 47.58 inches. The mean monthly rainfall for the last 10 years was 4.2 inches (Figure 3- 3). In general, wet springs, dry summers, and wet falls and winters are typical.

Figure 3-2. Annual Precipitation at Sam Rayburn Dam (TX7936)

Figure 3-3. Monthly Precipitation Averages at Sam Rayburn Dam (TX7936)

June 2003 3-6 Historical Data Review for Sam Rayburn Reservoir

3.5 Landuse

Multi Resolution Land Characteristics (MRLC 1993) data were used to assess the variety of landuse/land cover in the Angelina River watershed which contains Sam Rayburn Reservoir. These data were segregated by county to identify any major differences in land use types in the nine-county region that makes up the watershed. Table 3-2 describes the land use coverages within the watershed. Similar land use types were grouped for analysis purposes. For example, mixed forest, deciduous forest, and conifer forest all have similar physical properties such as infiltration and runoff rates so they were included in one “forest” group. Table A-1 in the Appendix at the end of Section 3.0 describes the landuse coverages segregated by county. Following are some of the highlights from these data as they potentially relate to the overall watershed characteristics and effects on water quality in Sam Rayburn Reservoir.

Table 3-2. Landuse as Determined by MRLC (1992) for the Sam Rayburn Reservoir Watershed Grouped Landuses Percent of Areac Area Area Landuse Type Landuse Area (mi2) Total (acres) (mi2) (acres) Area (%) Open water 122,521 191 Open water 122,521 191 5 Low-intensity residential 15,869 25 Low-intensity residential 15,869 25 1 High-intensity residential 4,772 8 High-intensity residential 4,772 8 0 Commercial/industrial 19,198 30 Bare rock/sand/clay 2,187 3 Industrial/mining/transitional 80,585 126 4 Quarries/strip mining 382 1 Transitional 58,818 92 Deciduous forest 496,927 777 59 Evergreen forest 339,680 531 Forest 1,354,089 2,116 Mixed forest 517,483 809 Grasslands 16 0 0 Grasslands/recreation 2,012 3 Urban recreation 1,996 3 Pasture/hay 516,420 807 Pasture/hay 516,420 807 23 Row crops 31,616 49 Cropland 31,616 49 1 Woody wetlands 128,323 201 Wetlands 7 153,248 240 Emergent wetlands 24,924 39 TOTAL AREA 2,281,131 3,564 TOTAL AREA 2,281,131 3,564 100

Nearly 60 percent of the watershed is forested, represented by approximately 1,354,000 acres, followed by pasture and hay production lands, represented by approximately 516,420 acres. Within the watershed as a whole, the various types of forested lands are similar in size with mixed forest making up the largest coverage (809 mi2), followed by deciduous (777 mi2) and evergreen (531 mi2) forest. However, the Counties of Angelina, Jasper, Sabine, and San Augustine, which make up the southern and southeastern region of the watershed surrounding Sam Rayburn Reservoir, are dominated by forestlands (65%-71%), principally made up of evergreen forest followed by mixed forest. The northern and northwestern regions of the watershed represented by Cherokee, Rusk and Smith Counties have far greater acreages of pasture/hay production lands and croplands (33%-39%), with forested lands (45%-55%) dominated by deciduous forests. Similar distributions of cropland/pasture lands were found in the 1997 Census data, from the National Agricultural Statistics Service (NASS), and they are shown in Section 6. Forest

June 2003 3-7 Historical Data Review for Sam Rayburn Reservoir

Inventory statistics (discussed in Section 6) indicate a larger amount of forested lands; however, these statistics are for the entire county and not limited by the watershed boundaries, which could account for the discrepancies in the numbers.

Approximately 122,520 acres are open waters within the watershed, representing 5 percent of the total coverage. Due in large part to Sam Rayburn Reservoir, Angelina (33,217 acres), Sabine (57,395 acres), and San Augustine (40,788 acres) Counties have the largest percentage of open water.

Wetlands account for 7 percent of the total land coverage within the watershed, comprising of 128,323 acres of woody wetlands and 24,924 acres of emergent wetlands. Among Counties the percentage of land coverage as wetlands is relatively even with as few as 14,808 acres (3.9%) in Sabine County and as much as 57,819 acres (9.4%) in Jasper County.

Both low-intensity and high-intensity residential make up a very small percentage (approximately 1%) of the total land coverage in the watershed. Smith and Angelina Counties are the only Counties with any appreciable acreage in residential use, 16,894 and 6,690 acres. Figure 3-2 presents the landuse coverage for the Sam Rayburn Reservoir watershed.

June 2003 3-8 Historical Data Review for Sam Rayburn Reservoir

Figure 3-4. MRLC Landuse Coverage for the Sam Rayburn Reservoir Watershed.

June 2003 3-9 Historical Data Review for Sam Rayburn Reservoir

3.6 Ecological Characterization

The Sam Rayburn Reservoir watershed lies entirely within the Austroriparian Biotic Province (Dice 1943; Blair 1950). In Texas the province comprises two vegetational regions, the long-leaf pine and the pine-oak forest regions (Tharp 1939). Longleaf pine (Pinus palutris) and loblolly pine (Pinus taeda) were dominant in much of the watershed, however, logging, silvicultural, and agricultural practices have led to a more monocultural distribution of loblolly pine with scattered young pine forest islands and emergent prairies. The pine-oak forest vegetational regions typical of the northern parts of the watershed are dominated by longleaf pine, loblolly pine, yellow pine, post oak (Quercus stellata), blackjack oak (Quercus marilandica), and red oak (Quercus rubra). Bottomland areas adjacent to perennial streams are dominated by complexes of sweetgum (Liquidambar styraciflua), water oak (Quercus nigra), magnolia (Magnolia grandiflora), tupelo (Nyssa sylvatica), and various other species of oaks, elms, and ashes. The construction of dams resulting in upstream flooding and the clearing of bottomlands for agricultural production have led to the loss of thousands of acres of historical bottomland hardwood forests.

El Hage and Moulton of the Texas Parks and Wildlife Department conducted an in-depth assessment of the ecological resources of a six-county region, which includes several of the Counties in the Angelina River watershed. Their findings compiled in Evaluation of Selected Natural Resources in Angelina, Cherokee, Gregg, Nacogdoches, Rusk , and Smith Counties, Texas( El Hage and Moulton 1998). An excerpt from the Executive Summary of that document notes the following:

The study area contains three major types of bottomland hardwood forests. The most extensive type is the water oak-willow oak-blackgum association. Forested wetlands are the most threatened wetland type in the United States. These losses would require substantial mitigation. These wetlands, in conjunction with the large reservoirs in the study area, support a diverse fauna and flora consisting of wetland dependent, aquatic, semi-aquatic, and riparian species.

The study area rivers and streams have a variety of fish species. Two of those fish species are listed as state threatened species, the paddlefish and the creek chubsucker. Many species of migrating birds, waterfowl, wintering shorebirds, and neotropical stopover in the study area to rest and to feed along the river banks and creek bottoms. Of the 1,100 vertebrate species in Texas, at least 64 species of mammals, amphibians, and reptiles, that are either aquatic, semi-aquatic, or in some way wetland-dependent, are present in the study area.

Substantial amounts of surface water are available from the reservoirs of the area. The development of these reservoirs has caused substantial loss of habitat for wildlife and some native river fishes.

Texas Parks and Wildlife has defined several areas within the Angelina River Watershed as Unique habitats. Angelina River segment 0611 is listed by Texas Parks and Wildlife as an ecologically unique river and stream segment for its biological function as priority bottomland hardwood habitat, and habitat for the threatened (state-listed) paddlefish (Polyodon spathula). Alazan Bayou, a tributary of the Angelina River in Nacogdoches County, is listed by Texas Parks and Wildlife as an ecological unique river and stream segment for biological function as priority bottomland hardwood habitat.

June 2003 3-10 Historical Data Review for Sam Rayburn Reservoir

A portion of Attoyac Bayou segment 0612 is the only known remaining population of the endemic triangle pigtoe freshwater mussel. Mud Creek in Cherokee County is listed by Texas Parks and Wildlife as an ecologically unique river and stream segments for its biological function as priority bottomland hardwood habitat and habitat for the perennial herb Neches River rose-mallow a candidate for federal endangered species listing.

Candidate, threatened, and endangered species of concern are found in Counties of the Angelina River Watershed. Table 3-3 presents relative data for habitat, known county distributions, and likely presence or absence of those species, considered as of this writing, to be state or federally listed/federal candidate threatened or endangered species for the Counties included in the Sam Rayburn Reservoir watershed. No species are specifically listed for the Reservoir, although the paddlefish is listed for Segment 0611 immediately adjacent to reservoir segment 0610.

June 2003 3-11 Historical Data Review for Sam Rayburn Reservoir

Table 3-3. Potential Threatened and Endangered Species in the Sam Rayburn Reservoir Watersheda Federal State Presence Scientific Name Common Name County Habitat Status Status Likely Birds Falco peregrinus American peregrine DL E Cherokee, Jasper, Newton, Rusk, Meadows, mudflats, beaches, marshes, No anatum falcon Sabine, and Smith and lakes where birds are abundantb Falco peregrinus Arctic peregrine DL T Angelina, Cherokee, Jasper, Meadows, mudflats, beaches, marshes, No tundrius falcon Nacogdoches, Newton, Rusk, and lakes where birds are abundantb Sabine, San Augustine, Shelby, and Smith Haliaeetus Bald eagle LT-PDL T Angelina, Cherokee, Jasper, Quiet coastal areas, rivers or lakeshores Yes leucocephalus Nacogdoches, Newton, Rusk, with large treesc Sabine, San Augustine, Shelby, and Smith Aimophila aestivalis Bachman's sparrow T Angelina, Cherokee, Jasper, Open pine woods with scattered brushes Yes Nacogdoches, Newton, Rusk, or understorya Sabine, San Augustine, Shelby, and Smith Mycteria americana Wood storck T Angelina, Cherokee, Jasper, Mudflats and other wetlands, even those Yes Nacogdoches, Newton, Rusk, associated with foresta Sabine, San Augustine, Shelby, and Smith Piccoides borealis Red-cockaded LE E Angelina, Cherokee, Jasper, Old growth pine forest; prefers longleaf, Yes woodpecker Nacogdoches, Newton, Rusk, shortleaf, and loblolly. Sabine, San Augustine, and Shelby Elanoides forticatus Swallow-tailed kite T Angelina, Cherokee, Jasper, Lowland forest areas, especially swampy Yes Nacogdoches, Newton, Sabine, areas; marshes, along rivers, lakes, and San Augustine, and Shelby ponds Plegadis chihi White-faced ibis T Jasper, Newton,and Sabine Freshwater marshes, sloughs, and irrigated Yes rice fields Fishes Erimyzon oblongus Creek chubsucker T Angelina, Cherokee, Jasper, Small rivers and creeks of various types; Yes Nacogdoches, Newton, Rusk, seldom impoundments; prefers Sabine, San Augustine, Shelby, headwaters, but seldom occurs in springsa and Smith Cycleptus elongatus Blue sucker T Jasper, Newton and Sabine Channels and flowing pools with a Yes moderate current

June 2003 3-12 Historical Data Review for Sam Rayburn Reservoir

Polyodon spathula Paddlefish T Angelina, Cherokee, Jasper, Large, free -flowing rivers with swiftly Yes Nacogdoches, Newton, Rusk, flowing waters; will frequent Sabine, San Augustine, Shelby, impoundments with access to spawning and Smith areasd Mammals Ursus Americanus Black bear T/SA T Angelina, Cherokee, Jasper, Remote, less-accessible mountainous No Nacogdoches, Newton, Rusk, areas or nearly impenetrable thickets Sabine, San Augustine, Shelby, along watercourses.f and Smith Ursus americanus Lousiana black bear LT T Angelina, Cherokee, Jasper, Remote bottomlands, floodplains and No luteolus Nacogdoches, Newton, Rusk, upland hardwoods. e Sabine, San Augustine, Shelby, and Smith Corynorhinus Rafinesque's big- T Angelina, Cherokee, Jasper, Roosts in cavity trees of bottomland Yes rafinesquii eared bat Nacogdoches, Newton, Rusk, hardwoods, concrete culverts, and Sabine, San Augustine, and abandoned man-made structures Shelby. Canis rufus Red wolf LE E Extirpated Extirpated No

Reptiles Macroclemys Alligator snapping T Angelina, Cherokee, Jasper, Deep-water rivers, canals, lakes, and No temminckii turtle Nacogdoches, Newton, Rusk, oxbows; also swamps, bayous, and ponds Sabine, San Augustine, Shelby, near deep running water; occasionally and Smith enters brackish waters.a Crotalus horridus Timber/canebrake T Angelina, Cherokee, Jasper, Swamps, floodplains, upland pine and No rattlesnake Nacogdoches, Newton, Rusk, deciduos woodlands, riparian zones, Sabine, San Augustine, Shelby, abandoned farmland; prefers dense ground and Smith cover.a Pituophis ruthveni Louisiana pine snake C1 T Angelina, Cherokee, Jasper, Mixed deciduous-longleaf pine woodlands Yes Nacogdoches, Newton, Rusk, Sabine, San Augustine, Shelby, and Smith Cemophora coccinea Northern scarlet T Jasper, Newton, and Sabine Mixed hardwood scrub on sandy soils Yes copei snake Cemophora coccinea Scarlet snake T Newton Mixed hardwood scrub on sandy soils No

June 2003 3-13 Historical Data Review for Sam Rayburn Reservoir

Phrynosoma cornutum Texas horned lizard T Angelina, Cherokee, Jasper, Arid to semiarid open country with sparse No Nacogdoches, Newton, Rusk, plant growth; must have some loose soil Sabine, San Augustine, Shelby, to bury themselves g and Smith Plants Siprathes parskii Navasota ladies'- LE E Jasper Endemic; margins of and openings within Yes tresses post oak woodlands in sandy loams along intermittent tributaries of rivers Leavenworthia texana Texas golden glade C1 Sabine, San Augustine Vernal wet glades on Weches Formation No cress ironstone outcrops Hibiscus dasycalyx Neches River rose- C1 Cherokee Endemic; wet alluvial solis in swamps or Yes mallow open riparian woodlands Lesquerella pallida White bladderpod LE E San Augustine Seasonally wet, comparatively high pH No sandy soils in natural openings or glades within pine/oak forests over Weches Formation ironside/glauconite DL, PDL: Delisted, Proposed Delisted LE, LT: Federally listed as Endangered/threatened T/SA: Federally Threatened by Similarity of Appearance C1: Federal Candidate, Category 1 E, T: State listed as Endangered/Threatened a Based on the Texas Parks and Wildlife Department, Endangered Resources Branch, Special Species List, for Angelina, Cherokee, Jasper, Nacogdoches, Newton, Rusk, Sabine, San Augustine, Shelby, and Smith Counties. b http://www.tpwd.state.tx.us/nature/endang/birds/peregrin.htm c http://www.tpwd.state.tx.us/nature/birds/baldeagl.htm d http://www.tpwd.state.tx.us/expltx/eft/nasa/species/paddlefish.htm e http://www.tpwd.state.tx.us/nature/endang/animals/blakbear.htm f http://www.nsrl.ttu.edu/tmot1/ursuamer.htm g http://sevilleta.unm.edu/data/species/reptile/socorro/profile/texas-horned-lizard.html

June 2003 3-14 Historical Data Review for Sam Rayburn Reservoir

APPENDIX 3A MRLC Landuse Areas and Oercent Covsergae by County for the Sam Rayburn Reservoir Watershed

June 2003 3A-1 Historical Data Review for Sam Rayburn Reservoir

Table A-1. MRLC (1992) Landuse areas and percent coverages for the Sam Rayburn Reservoir watershed counties Area (acres) by County

SAN County SMITH % RUSK % CHEROKEE % SHELBY % NACOGDOCHES % % SABINE % ANGELINA % JASPER % AUGUSTINE Open Water 11,782.2 2.5 8,105.4 1.4 7,299.9 1.1 23,463.9 4.4 20,929.3 3.3 40,788.4 10.7 57,395.7 15.3 33,217.0 6.1 19,629.4 3.2 Low-intensity 16,894.6 3.6 2,705.9 0.5 2,187.5 0.3 1,444.9 0.3 3,934.1 0.6 639.4 0.2 1,037.7 0.3 6,690.1 1.2 3,982.9 0.6 residential High-intensity 3,518.5 0.8 699.0 0.1 635.2 0.1 314.2 0.1 1,389.1 0.2 112.5 0.0 216.2 0.1 1,755.8 0.3 2,177.0 0.4 residential Commercial 9,899.9 2.1 6,309.8 1.1 5,077.5 0.8 2,844.0 0.5 4,651.6 0.7 1,954.2 0.5 1,757.6 0.5 4,626.5 0.8 6,427.9 1.0 Bare rock 1,823.6 0.4 1,104.2 0.2 667.0 0.1 300.7 0.1 371.8 0.1 51.2 0.0 31.8 0.0 166.6 0.0 788.2 0.1 Quarries 160.3 0.0 2,709.9 0.5 492.2 0.1 7.6 0.0 12.5 0.0 19.3 0.0 1.1 0.0 149.9 0.0 278.0 0.0 Transitional 1,845.2 0.4 5,978.4 1.0 16,434.9 2.4 9,489.1 1.8 16,592.1 2.6 12,238.6 3.2 15,853.6 4.2 13,394.3 2.5 31,117.1 5.0 Deciduous 131,159.5 28.3 149,975.4 25.1 179,870.5 26.7 126,152.8 23.7 148,767.8 23.3 71,898.0 18.9 56,947.5 15.1 97,373.6 17.8 57,633.6 9.3 Forest Evergreen 17,767.1 3.8 40,007.8 6.7 39,176.3 5.8 74,512.0 14.0 77,483.8 12.1 99,618.3 26.2 117,550.6 31.2 137,773.9 25.2 178,551.0 28.9 Forest Mixed Forest 61,418.5 13.3 122,293.3 20.5 150,617.0 22.3 160,086.3 30.0 161,803.4 25.3 94,281.7 24.8 91,305.2 24.3 119,575.5 21.9 196,721.9 31.9 Grasslands 129.2 0.0 1,650.2 0.3 0.0 0.0 0.0 0.0 0.0 0.0 2.0 0.0 0.0 0.0 0.0 0.0 9.6 0.0 Urban 1,008.1 0.2 226.6 0.0 366.1 0.1 146.6 0.0 808.8 0.1 157.5 0.0 36.5 0.0 661.6 0.1 996.1 0.2 Recreation Pasture/hay 163,327.5 35.2 199,102.2 33.4 209,789.3 31.1 96,834.3 18.2 147,837.7 23.1 36,123.0 9.5 16,955.8 4.5 84,796.4 15.5 60,255.4 9.8 Row crops 17,012.0 3.7 13,479.1 2.3 12,621.3 1.9 5,303.7 1.0 7,409.5 1.2 2,381.2 0.6 2,442.3 0.6 4,556.6 0.8 842.9 0.1 Small grains 0.0 0.0 21.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Woody 19,361.6 4.2 33,727.8 5.7 41,789.6 6.2 27,330.2 5.1 39,077.5 6.1 17,002.2 4.5 13,661.0 3.6 36,426.4 6.7 51,155.3 8.3 wetlands Emergent 6,364.2 1.4 8,601.8 1.4 7,738.4 1.1 4,825.5 0.9 8,006.2 1.3 2,259.3 0.6 1,147.8 0.3 5,075.7 0.9 6,664.0 1.1 wetlands Total 463,472.1 100 596,697.7 100 674,762.4 100 533,055.6 100 639,075.3 100 379,526.6 100 376,340.2 100 546,239.8 100 617,230.2 100 Grouped Land Use Categories 3.2 Open water 11,782.2 2.5 8,105.4 1.4 7,299.9 1.1 23,463.9 4.4 20,929.3 3.3 40,788.4 10.7 57,395.7 15.3 33,217.0 6.1 19,629.4 Low-intensity 0.6 16,894.6 3.6 2,705.9 0.5 2,187.5 0.3 1,444.9 0.3 3,934.1 0.6 639.4 0.2 1,037.7 0.3 6,690.1 1.2 3,982.9 residential High-intensity 0.4 3,518.5 0.8 699.0 0.1 635.2 0.1 314.2 0.1 1,389.1 0.2 112.5 0.0 216.2 0.1 1,755.8 0.3 2,177.0 residential Industrial/ 6.3 mining/ 13,729.0 3.0 16,102.2 2.7 22,671.5 3.4 12,641.3 2.4 21,628.0 3.4 14,263.2 3.8 17,644.1 4.7 18,337.3 3.4 38,611.1 transitional 70.1 Forest 210,345.1 45.4 312,276.5 52.3 369,663.7 54.8 360,751.0 67.7 388,055.0 60.7 265,797.9 70.0 265,803.3 70.6 354,723.0 64.9 432,906.5 Grasslands/ 0.2 1,137.3 0.2 1,876.8 0.3 366.1 0.1 146.6 0.0 808.8 0.1 159.5 0.0 36.5 0.0 661.6 0.1 1,005.7 recreation 9.8 Pature/hay 163,327.5 35.2 199,102.2 33.4 209,789.3 31.1 96,834.3 18.2 147,837.7 23.1 36,123.0 9.5 16,955.8 4.5 84,796.4 15.5 60,255.4 0.1 Cropland 17,012.0 3.7 13,500.2 2.3 12,621.3 1.9 5,303.7 1.0 7,409.5 1.2 2,381.2 0.6 2,442.3 0.6 4,556.6 0.8 842.9 Wetlands 25,725.9 5.6 42,329.6 7.1 49,528.0 7.3 32,155.7 6.0 47,083.7 7.4 19,261.5 5.1 14,808.8 3.9 41,502.0 7.6 57,819.3 9.4

June 2003 3A-2 Historical Data Review for Sam Rayburn Reservoir

Total 463,472.1 100.0 596,697.7 100.0 674,762.4 100.0 533,055.6 100.0 639,075.3 100.0 379,526.6 100.0 376,340.2 100.0 546,239.8 100.0 617,230.2 100

June 2003 3A-3 Historical Data Review for Sam Rayburn Reservoir

4.0 Reservoir Characteristics

This section discusses the history of Sam Rayburn Reservoir; some of the physical data available for the reservoir, including capacity, surface area, shoreline, average depth, maximum depth, and annual water level fluctuation; and the water quality data available for the reservoir. Water quality monitoring data were downloaded from the Texas Review and Comment System (TRACS) and EPA’s STORET databases and analyzed. Analysis of the TRACS data is presented in Section 4.2 and the analysis of the STORET data is presented in Section 4.3.

4.1 Hydraulics

4.1.1 Reservoir Operations

Sam Rayburn Reservoir was constructed by the U.S. Army Corps of Engineers, Fort Worth District, and continues to be owned and operated by the Corps. Primary operation goals for the reservoir include control of flood waters, generation of hydroelectric power, and maintenance of an operating pool to sustain municipal, industrial, agricultural, and recreational uses. Construction of the reservoir began in September 1956. Impoundment began on March 29, 1965, creating a conservation pool of 164.4 feet above mean sea level (msl). The reservoir is an earthfill dam and has a spillway crest elevation of 176 feet and a top flood-control pool capacity of 3,997,600 acre-feet (Texas State Historical Association 2002). The reservoir impounds approximately 114,500 surface acres, creating 750 miles of shoreline and an overall length of 43 miles. It is the largest body of water in the state of Texas (USACE 2003). Sam Rayburn Reservoir has a mean depth of 20 feet and maximum depth of approximately 90 feet; the annual average water level fluctuation is 8 feet.

The dam is an earth embankment approximately 17,230 feet long, with concrete combined power intake and flood control outlet works located near the west abutment. The initial design resulted in excess water release, which was accommodated by a 2,300-foot concrete weir uncontrolled spillway approximately 7,000 feet west of the main embankment. Between 1994 and 1996, however, the spillway was updated. A 640-foot labyrinth weir spillway (with stilling basin) was constructed at the same location and with the same crest elevation (176 feet, msl) as the original spillway to prevent erosion in the event of water release (USACE 2003)

According to the Corps of Engineers (USACE 2003),

Sam Rayburn Power House is one of only three hydroelectric generating facilities operated by the U.S. Army Corps of Engineers in Texas within the Fort Worth District. All three power plants are operated from the control room of the Sam Rayburn Power House, which is staffed 24 hours a day. The Sam Rayburn Power House contains two generators, each capable of generating 26,000 kilowatt-hours. Release of water is accomplished through two 18 foot x 26 foot power conduits and two 10 foot x 20 foot gated flood control conduits.

June 2003 4-1 Historical Data Review for Sam Rayburn Reservoir

4.1.2 Water Surface Elevation

Elevation and evaporation data were obtained from U.S. Geological Survey (USGS) monitoring stations on the reservoir. Elevation data were provided for Sam Rayburn Reservoir for the time period of 1969 through 2002. Figure 4-1 presents the elevation levels of the reservoir during this time period.

175

170

165

160

Elevation (feet msl) 155

150

145 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 Year Figure 4-1. Average Water Surface Elevation of Sam Rayburn Reservoir (1969-2002)

Note that during the time period of 1990 through 2003 (the period used for water quality data analysis for this study), the lowest water surface elevation was during 1996. This elevation represents the effects of a severe drought in Texas during that time period.

USGS evaporation data show seasonal and annual trends in the evaporation of Sam Rayburn Reservoir. Monthly evaporation data were provided for the time period 1993 through 2002. Based on total monthly average evaporation, August tends to have the largest amount of evaporation, with an average of 7.6 inches (Figure 4-2).

June 2003 4-2 Historical Data Review for Sam Rayburn Reservoir

4 Inches 3

0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Months

Figure 4-2. Average Monthly Total Evaporation at Sam Rayburn Reservoir from 1993 Through 2002.

Over the past 10 years (1993 through 2002), the greatest amount of evaporation in the reservoir occurred in 2000 (68.2 inches), 1998 (65.08 inches), 1999 (63.04 inches), and 1996 (61.13 inches). These were the years with annual evaporation levels greater than 60 inches during the period of record (Figure 4-3).

June 2003 4-3 Historical Data Review for Sam Rayburn Reservoir

40 Inches 30

0 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 Year

Figure 4-3. Total Annual Evaporation at Sam Rayburn Reservoir for the Period 1993 Through 2002.

4.2 Sam Rayburn Reservoir TRACS Water Quality Data

Water quality monitoring data were drawn from TCEQ’s Texas Review and Comment System (TRACS) database for the two segments composing the Sam Rayburn Reservoir, 0610 and 0615 (segment 0610 includes subsegment 0610a). It is important to note that not all sample stations fall within the boundaries of the reservoir. Some stations, although within the segment being evaluated, are located in tributary streams to the reservoir. Where clear distinctions between lotic (moving waters) and lentic (still waters) waters are necessary to understand the dynamics of the parameter in question, sites that might fall outside the reservoir boundary are identified. Because this assessment is evaluating water quality for the entire segment, however, summary statistics for all sites within the defined boundaries of the segment are included by segment and station. In some cases this approach might indicate that an exceedance of criteria has occurred in the reservoir, when in fact the exceedance occurred in a tributary within the defined segment. This is important to understand because impacts that occur in tributary streams can easily translate to impacts in the reservoir.

June 2003 4-4 Historical Data Review for Sam Rayburn Reservoir

Data in TRACS span a considerable time period, from about 1974 to the present. This assessment focuses on data from 1990 to the present because these are the most relevant data with respect to evaluating the current conditions of the reservoir and the relatively recent past. These data include at least one major drought period in 1996 and 1997, as well as periods when the reservoir was operating at or near full pool.

Some records in TRACS provided by TCEQ were not included in the data analysis because of various data qualifiers. Records with the following remarks were eliminated from the data set:

• D: Did not pass all quality control (QC) criteria • E: Lab error • ME: Analytical method not consistent with data quality objectives (DQOs) • NO: Data not collected under approved agency quality assurance project plan (QAPP)

For most parameters, surface measurements were available from several locations within a segment. TCEQ’s (2002) Guidance for Assessing Texas Surface and Finished Drinking Water Quality Data, 2002 indicates that surface measurement data, typically collected at a depth of 1 foot from the water surface, are generally used for assessing water, temperature, chloride, sulfate, total dissolved solids, nutrients, chlorophyll a, fecal coliform bacteria, E. coli, and enterococci. Although depth-integrated data are available for certain parameters measured using direct reading instruments, this assessment examines depth-integrated data for only dissolved oxygen (DO) and pH because dissolved oxygen and pH criteria apply to the entire mixed water column, or only to measurements made in the mixed surface layer if the water column is stratified.

The following water quality parameters were reviewed to assess the water quality within the reservoir:

• Water temperature • Nitrate and nitrite • Chloride • Transparency • Total Kjeldahl • Sulfate • Conductivity nitrogen • Dissolved arsenic • Dissolved oxygen • Total nitrogen • Dissolved • Biolochemical • Phosphorus aluminum oxygen demand • Total organic • Dissolved copper • pH carbon • Dissolved lead • Total alkalinity • Chlorophyll a • Total selenium • Total solids • Fecal coliform • Dissolved zinc • Dissolved solids bacteria • Dioxin • Ammonia

Texas Surface Water Quality Standards (TSWQS) used for this assessment are based on the August 17, 2000 edition of Chapter 307: TSWQS §§307.1-307.10, pending approval from EPA Region 6. Nutrients that have no criteria identified in Texas’s Surface Water Quality Standards were compared to one or both of two values: EPA (2000) ecoregional reference values for Region IX reservoirs or TCEQ’s (2000) screening level values found in Guidance for Assessing Texas Surface and Finished Drinking Water Quality Data, 2002.

June 2003 4-5 Historical Data Review for Sam Rayburn Reservoir

See Section 1.3 for a detailed discussion of the applicable water quality criteria and other targets.

4.2.1 TRACS Monitoring Stations at Sam Rayburn Reservoir (Segments 0610 and 0615)

Monitoring stations identified in the TRACS database are listed in Table 4-1. Figure 4-4 presents the locations of the stations.

Table 4-1. Water Quality Monitoring Stations in Segments 0610 and 0615 Station Station location Segment 0610 10483 Ayish Bayou at US 96 west of San Augustine 10503 Paper Mill Creek immediately Upstream from Angelina River Confluence 10611 Sam Rayburn Reservoir in powerhouse intake structure of dam 10612 Sam Rayburn Reservoir at SH 147 bridge SW of Broaddus and NE of Zavalla 10613 Sam Rayburn Reservoir at SH 103, 2.3 mi. west of Etoile 10614 Sam Rayburn Reservoir at SH 103, 6.5 mi. east of Etoile 10615 Sam Rayburn Reservoir at Marion’s Ferry 14906 Sam Rayburn Reservoir at Main Pool 14907 Sam Rayburn Reservoir at FM 83 bridge 15357 Turkey Creek at FM 705, 0.4 km upstream of Ayish Bayou Confluence 15358 Sandy Creek at FM 705, 2.0 km north of Fm 83 15359 Chiamon Bayou at FM 1751, 6.0 km south of Chinquapin 15360 Chinquapin Creek at FM 1751, 1.8 km south of Chinquapin 15361 Ayish Bayou at SH 103, 0.8 km east of FM 705 15362 Caney Creek at SH 147, 1.0 km upstream of Ayish Bayou Confluence 15363 Venado Creek at SH 147, 2.0 km upstream of Ayish Bayou Confluence 15364 Ayish Bayou at SH 147, 0.2 km south of San Augustine 15365 Ayish Bayou at FM 3230, 3.0 km north of San Augustine 15366 Carrizo Creek at FM 2213, 2.4 km south of San Augustine 15522 Sam Rayburn Reservoir near Veach Basin 15523 Sam Rayburn Reservoir adjacent to Alligator Cove 15524 Sam Rayburn Reservoir near Shirley Creek 15525 Sam Rayburn Reservoir at Kingtown 15526 Sam Rayburn Reservoir between Needmore Point and Powell Park in the Ayish Bayou 15527 Sam Rayburn Reservoir near Mill Creek Park in the Bear Creek 15666 Sam Rayburn Reservoir USGS Site NC 15667 Sam Rayburn Reservoir USGS Site IC 15668 Sam Rayburn Reservoir USGS Site KC 15669 Sam Rayburn Reservoir USGS Site JC 15670 Sam Rayburn Reservoir USGS Site GC 15671 Sam Rayburn Reservoir USGS Site FC 15672 Sam Rayburn Reservoir USGS Site CC 15673 Sam Rayburn Reservoir USGS Site AC 15674 Sam Rayburn Reservoir USGS Site IC 15675 Sam Rayburn Reservoir USGS Site MC 16784 Sam Rayburn Reservoir at San Augustine Park Swimming Area 16785 Sam Rayburn Reservoir at East End Swimming Area

June 2003 4-6 Historical Data Review for Sam Rayburn Reservoir

16786 Sam Rayburn Reservoir at Ebenezer Park Swimming Area 16787 Sam Rayburn Reservoir at Mill Creek Park Swimming Area 16788 Sam Rayburn Reservoir at Etoile Park Boat Ramp 16789 Sam Rayburn Reservoir at Marion Ferry Boat Ramp 16790 Sam Rayburn Reservoir at Cassel-Boykin Park Boat Ramp 16791 Sam Rayburn Reservoir at Jackson Hill Marina Swimming Area 16792 Sam Rayburn Reservoir at Hanks Creek Park Boat Ramp 16793 Sam Rayburn Reservoir at Shirley Creek Marina Boat Ramp Segment 0615 10496 Mill Creek at US 59 north of Lufkin 10497 Mill Creek at FM 2251 north of Lufkin 10498 Unnamed tributary of Mill Creek below Ellen Trout Dam north of Lufkin 10502 Paper Mill Creek Upper Bifurcation Channel, just upstream of Angelina River Confluence 10504 Paper Mill Creek at unnamed creek south of River Crest Estates 10505 Paper Mill Creek at FM 842 northeast of Lufkin 10506 Unnamed tributary of Paper Mill Creek at intersection of Moffett Rd and SH 287 in Lufkin 10507 Unnamed west tributary to Ellen Trout Lake at FM 2251 in Lufkin 10508 Unnamed east tributary to Ellen Trout Lake at SH 287 10616 Sam Rayburn Reservoir at Pipeline 7.67 km upstream of Marion's Ferry 10617 Sam Rayburn Reservoir at Moran's 11.67 km upstream of Marion's Ferry 10618 Sam Rayburn Reservoir Downstream, 3.5 km from Paper Mill Cr Confluence 10619 Sam Rayburn Reservoir Downstream, 2.0 km from Paper Mill Creek Confl. 10620 Sam Rayburn Reservoir 1.0 km downstream from Paper Mill Creek Confluence 10621 Sam Rayburn Reservoir 0.7 km downstream of Confluence with Paper Mill Creek 10622 Sam Rayburn Reservoir, 0.2 km downstream from Paper Mill Creek Confl. 10623 Sam Rayburn Reservoir at Confl of Angelina River, 0.75km NW of Paper Mill Creek

June 2003 4-7 Historical Data Review for Sam Rayburn Reservoir

15365

15364 #S 15366 10502 10614 #S 10621 16788 #S 10623 15363 15525 #S 15666 15361 #S 15362 10619 &V 15667 &V&V 15360 #S #S 10615 #S 15357 #S #S #S 15359 #S#S#S #S 16789 15523 #S 10613 16793 15358 14907 #S #S#S #S #S #S 16791 15669 #S #S #S #S 16784 10612 15668 15524 15675 15527 #S #S #S 15674 #S 16790 #S #S 16792 15671 #S #S #S#S #S 16787 15670 15522 15672 #S #S#S #S 15526 16786 15673 14906 16785

Sample Station #S 610 &V 615 Basin River or Stream County Boundary Reservoir

Figure 4-4. TRACS Water Quality Monitoring Stations in Sam Rayburn Reservoir

June 2003 4-8 Historical Data Review for Sam Rayburn Reservoir

4.2.2 Water Quality Data Analysis

The following sections provide summaries of available water quality data at stations in segments 0610 and 0615, including number of samples, minimum, average, maximum, and the number of samples exceeding water quality criteria or targets. Sam Rayburn Reservoir was placed on Texas’s 2000 and 2002 section 303(d) lists of impaired waterbodies for dissolved oxygen, pH, and aluminum impairments, therefore, these three parameters were analyzed for the reservoir. Any parameters that affect dissolved oxygen (i.e., nutrients and chlorophyll a) were also included in the analysis. Additional parameters were included in the analysis at the request of TCEQ to determine whether there are any other potential impairments of the reservoir. For parameters that have water quality criteria or screening levels, the number of exceedances was determined for each of the stations. Section 1.3 discusses the appropriate water quality criteria and screening levels.

4.2.2.1 Dissolved Oxygen and Nutrients

Dissolved Oxygen

Dissolved oxygen is one of the primary water quality measurement parameters by which TCEQ assesses use support of a waterbody. Each classified waterbody in the TSWQS is assigned one of the following aquatic life uses, based on physical, chemical, and biological characteristics: exceptional, high, intermediate, limited, or no significant aquatic life use. Dissolved oxygen criteria (24-hour averages) to protect these aquatic life uses for freshwater are 6.0, 5.0, 4.0, 3.0, and 2.0 mg/L, respectively (TNRCC 2002). These criteria are applied within the mixed surface layer. For reservoirs, the mixed surface layer is defined as the portion of the water column from the surface to the depth at which water temperature decreases by greater than 0.5 °C. Dissolved oxygen and pH criteria apply to the entire mixed water column or to only measurements made in the mixed surface layer if the water column is stratified (TNRCC 2002).

Segment 0610: Dissolved Oxygen

Dissolved oxygen data collected as surficial samples (0.3 meter below the water surface) were evaluated for the period from 1990 to present. Substantially more dissolved oxygen data are available in TRACs, measured at various times and locations. These data are discussed later in this section relative to five specific sites in the reservoir with several years of records displaying dissolved oxygen at depth. For the surficial records, summary statistics were generated, as well as a count of exceedances (Table 4A-1 in Appendix 4A). Tables 4A-1 through 4A-39 are presented in Appendix 4A at the end of Section 4.0 due to their large size.

Segment 0610, which represents the largest spatial extent of the reservoir, had the largest number of records and stations. Thirty-nine sampling stations in segment 0610 representing almost 500 surficial records over a period of more than 10 years showed relatively good mean dissolved oxygen values. The lowest mean dissolved oxygen was calculated as 5.33 mg/L at station 15357. There were few criterion exceedances for these surficial samples (e.g., <3.0 mg/L); only two samples were measured as less than 3.0 mg/L. These exceedances were recorded at sites 15357

June 2003 4-9 Historical Data Review for Sam Rayburn Reservoir and 15358 in Ayish Bayou tributary streams (unclassified segment 0610a). Based on these data, no exceedances of the criteria were observed from sites within the reservoir portion of segment 0610.

Twenty-four-hour minimum dissolved oxygen data are summarized in Table 4A-2 for segment 0610, for which relatively few measurement data were available. Unlike the surficial grab sample data that could be compiled for a single depth measurement, 24-hour minimum dissolved oxygen data were available from a variety of depths; however, judging from the sample depths, all measurements were within the mixed surface layer. Two exceedances of the minimum criterion (3.0 mg/L) were recorded from this data set at stations 10614 (2.7 mg/L) in the Attoyac Bayou arm of the reservoir and 14907 (0.7 mg/L) in the Ayish Bayou arm of the reservoir. Both exceedances occurred in 2001.

Twenty-four-hour average dissolved oxygen data are summarized in Table 4A-3 for segment 0610, where relatively few measurement data were available. These data had a depth distribution similar to that for the 24-hour minimum dissolved oxygen because these values were derived from the same measurement data sets. Two 24-hour average dissolved oxygen values exceeded the criterion (5.0 mg/L) at sites 14907 and 15361 in the Ayish Bayou arm of the reservoir. Only station 14907 is located within the reservoir. At station 14907 the 24-hour mean dissolved oxygen was 2.3 mg/L, while at station 15361 the 24-hour mean dissolved oxygen was 4.63 mg/L.

Dissolved oxygen at depth was assessed using a graphical approach to illustrate dissolved oxygen dynamics at several locations within the reservoir across depths and seasonal changes. These data were grouped into two primary seasonal categories: (1) late spring, summer and fall and (2) winter and early spring. These groupings facilitate evaluation of the depth level at which the reservoir stratifies based on the time of year and the location within the reservoir. Appendix 4B at the end of Section 4.0 presents the dissolved oxygen graphs as well as a detailed discussion of the results.

Overall, the depth profile data indicate that dissolved oxygen stratification occurs during the summer months, resulting in hypolimnetic oxygen deficits. Mixed surface layers differ widely depending upon the time of year, but dissolved oxygen concentrations in this layer do not exceed the minimum criterion of 3.0 mg/L. Station 10613 is much less similar in profile to the other stations evaluated during the summer months; during the winter months, however, dissolved oxygen at all sites suggests the reservoir is well mixed and unstratified.

Segment 0615: Dissolved Oxygen

Only three locations in segment 0615 where dissolved oxygen grab samples had been collected were found in the database. Data from these three sites were collected between 1990 and 2002 (Table 4A-1). Measurement data were available for 152 samples with mean dissolved oxygen concentrations ranging from 4.1 to 6.9 mg/L. Lower dissolved oxygen minima were found at these sites, with the lowest surficial grab sample recording a dissolved oxygen concentration of 1.9 mg/L. Over the period evaluated, a total of 19 sample measurements fell below the dissolved oxygen minimum criterion of 3.0 mg/L. This is a sharp contrast to segment 0610, which had only

June 2003 4-10 Historical Data Review for Sam Rayburn Reservoir two dissolved oxygen concentrations below the minimum criterion.

Table 4A-2 shows the 24-hour dissolved oxygen minimum values recorded for segment 0615. These data ranged in time from 1998 to 2001, representing 21 separate monitoring events at the three locations. Of the 21 events, 6 dissolved oxygen minima fell below the minimum dissolved oxygen criterion of 3.0 mg/L. Table 4A-3 shows the corresponding 24-hour dissolved oxygen averages monitored during this time frame. Similarly, six of the 24-hour dissolved oxygen average concentration fell below the 24-hour mean dissolved oxygen criterion of 5.0 mg/L. Stations 10621 and 10623 are on the Angelina River near Papermill Creek; station 10502 is in Papermill Creek.

Chlorophyll a and Secchi Depth

Chlorophyll a is a measure of the photosynthetic capacity of algae and algal biomass. The more chlorophyll a in the water, the higher the algal biomass and the higher the photosynthetic capacity. Chlorophyll a is an important variable in understanding the eutrophication potential of reservoirs because it provides a direct link with the nutrient concentrations, algal biomass, and photosynthetic activity that affect dissolved oxygen concentrations. No criteria are promulgated for chlorophyll a, but both TCEQ and EPA have developed screening criteria for this parameter. The EPA (2000) ecoregional screening value for reservoirs in ecoregion IX is 2.834 µg/L, while TCEQ’s screening value is 21.4 µg/L.

Similarly, Secchi depth is a companion measure by which limnologists assess eutrophication. The measure evaluates water transparency. The deeper the transparency, the greater the photic zone and the less light penetration is diminished by light-scattering or -absorbing factors such as algae. The EPA (2000) ecoregional screening value for reservoirs in ecoregion IX is 1.1 meters.

Segment 0610: Chlorophyll a

In segment 0610 of Sam Rayburn Reservoir, chlorophyll a was measured at nine stations from 1990 to 2002 for a total 118 measurements (Table 4A-4). Concentrations averaged from 1.8 to 28 µg/L. Of the measurement data for segment 0610, 70 samples had concentrations of chlorophyll a that exceeded the ecoregional values from EPA, while only 5 samples exceeded TCEQ’s screening value. Except for the highest value observed, mean chlorophyll a concentrations are similar to those observed in an EPA eutrophication study conducted for the reservoir (USEPA, 1974), which found at the time that Sam Rayburn Reservoir was a eutrophic reservoir. A 1998 Reservoir Assessment conducted by TCEQ found that based on chlorophyll a concentrations, Sam Rayburn Reservoir falls in the mesotrophic range. Based on the mid-range mean value, Carlon’s Trophic Index for chlorophyll a is 54.95, which is considered to be on the low end of the eutrophic category.

June 2003 4-11 Historical Data Review for Sam Rayburn Reservoir

Segment 0615: Chlorophyll a

In segment 0615, chlorophyll a was measured at four stations from 1991 to 2002 for a total 119 measurements (Table 4A-4). On average, mean chlorophyll a concentrations were generally lower in segment 0615 than in segment 0610. Mean chlorophyll a in segment 0615 ranged from 3.4 to 7.6 µg/L. Of the 119 values, 63 exceeded the EPA ecoregional reference value, whereas only 4 values exceeded TCEQ’s screening value. Based on the mid-range mean value, Carlson’s Trophic Index for chlorophyll a is 42.9, which is considered to fall within the mesotrophic range.

Segment 0610: Secchi Depth

In segment 0610 Secchi depth was determined at 21 locations from 1991 to 2002 for a total of 401 measurements (Table 4A-5). Average Secchi depths at stations ranged from 0.45 meter to 2.18 meters. Of the 401 samples, 158 were less than the ecoregional screening levels. Depth values less than the screening levels suggest lower transparency, which might be due to excessive algal production or other factors that reduce water clarity. The mean Secchi depth for segment 0610 is 1.31 meters, which is consistent with the mean Secchi depth reported by TCEQ in its Reservoir Assessment (1998). EPA’s eutrophication assessment in 1974 showed Secchi depth measurements that averaged 1.63 meters. Overall, historical depths are not substantially different from present-day depths.

Segment 0615: Secchi Depth

In segment 0615 Secchi depth was determined at 3 locations from 1990 to 2002 for a total of 133 measurements. Average Secchi depths at stations ranged from 0.24 meter to 0.41 meter. Of the 133 samples, 132 were less than the ecoregional screening value. The mean Secchi depth for segment 0610 is 1.31 meters, which is consistent with the mean Secchi depth reported by TCEQ in its Reservoir Assessment (1998). Table 4A-5 summarizes the Secchi depth data for segment 0615.

Nutrients

Phosphorus is often considered a limiting nutrient with respect to algal productivity in reservoirs. In fact, the relationship between total phosphorus and algal biomass is so strong that total phosphorus is considered a leading indicator used by limnologists to assess reservoir eutrophication. EPA’s ecoregional reference values for reservoirs for total phosphorus is 0.0325 mg/L, while TCEQ’s screening value is 0.18 mg/L. Soluble or reactive phosphorus is measured as ortho-phosphate. This fraction is the available phosphorus in waters. TCEQ’s screening level value for ortho-phosphorus is 0.05 mg/L.

June 2003 4-12 Historical Data Review for Sam Rayburn Reservoir

Segment 0610: Total and Ortho-Phosphorus

In segment 0610, total phosphorus averaged between 0.03 and 0.5 mg/L as total phosphorus (Table 4A-6). Data were collected at 11 stations from 1990 to 2002 for a total of 242 measurements. Of these, 218 samples exceeded EPA’s ecoregional reference values, while 47 samples exceeded TCEQ’s screening value for total phosphorus. TCEQ’s 1998 reservoir assessment found a mean total phosphorus value for Sam Rayburn of 0.06 mg/L, and the mean of these data was 0.17 mg/L total phosphorus. EPA’s 1974 reservoir assessment found 0.035 to 0.143 mg/L total phosphorus.

Ortho-phosphorus in segment 0610 was measured at 17 locations over the time period 1990 to 2002, resulting in 242 samples (Table 4A-7). Mean ortho-phosphorus concentrations ranged from 0.01 mg/L to 0.2 mg/L. Of the 242 samples, 36 exceeded TCEQ’s screening value. Compared to EPA’s 1974 Reservoir Assessment, mean ortho-phosphorus values ranged from 0.004 to 0.106 mg/L. Data from this assessment indicate very similar trends in ortho-phosphorus.

Segment 0615: Total and Ortho-Phosphorus

In segment 0615 total phosphorus was measured at four stations from 1990 to 2002, with a total of 114 measurements (Table 4A-6). Mean total phosphorus across the sites ranged from 0.11 to 0.76 mg/L; 113 of the samples exceeded the ecoregional reference value, and 29 exceeded TCEQ’s screening value. These mean values are higher than the range of means observed in segment 0610 and are also higher than the observed range of means for EPA’s 1974 assessment.

Soluble ortho-phosphorus means in segment 0615 ranged from 0.11 to 0.53 mg/L (Table 4A-7) for data collected between 1991 and 1997. In total, 45 samples were collected from 4 stations, and 28 of the samples exceeded the TCEQ’s screening levels for ortho-phosphorus. Similar to total phosphorus, ortho-phosphorus means were typically higher in segment 0615 when compared to segment 0610 and EPA’s 1974 Reservoir Assessment data.

Segment 0610: Total Nitrogen

Total nitrogen is a derived value that considers the sum of organic and inorganic nitrogen avialable in water. Nitrogen is usually in excess concentrations in water relative to the needs of macrophytes and algae. EPA’s ecoregional reference value for reservoirs for total nitrogen is 0.492 mg/L.

In segment 0610, total nitrogen averaged between 0.4 and 1.1 mg/L as total nitorgen (Table 4A-

8). Data were derived from samples for nitrate plus nitrite nitrogen (NO2+NO3), total Kjeldahl nitrogen (TKN), and ammonia nitrogen (NH4) collected at three sites from 1990 to 1997. Twenty-three calculated values resulted in 19 exceedances of EPA’s ecoregional reference values. Total nitrogen reported as part of EPA’s 1974 assessment of the reservoir ranged from 0.575 to 0.631 mg/L. Of the summed nitrogen fractions, TKN consistently constituted the larger proportion of the total nitrogen value.

June 2003 4-13 Historical Data Review for Sam Rayburn Reservoir

Segment 0615: Total Nitrogen

In segment 0615, total nitrogen averaged between 1.6 and 4.8 mg/L as total nitrogen (Table

4A-8). Data were derived from samples for NO2+NO3, TKN, and NH4 nitrogen collected at four sites spanning from 1993 to 1997. Thirty-five calculated values resulted in 32 exceedances of EPA’s ecoregional reference values. Total nitrogen reported as part of EPA’s 1974 assessment of the reservoir ranged from 0.575 to 0.631 mg/L. Segment 0610 total nitrogen concentrations are substantially higher than those observed in 1974 and in segment 0610. Of the summed nitrogen fractions, TKN consistently constituted the larger proportion of the total nitrogen value.

Segment 0610: Nitrate and Nitrite Nitrogen

Nitrate and nitrite nitrogen provide information on the inorganic fraction of nitrogen that enters the waterbody. Nitrite results from the denitrification of nitrate through bacterial reduction. EPA’s ecoregional reference value for reservoirs for total nitrate+nitrite nitrogen is 0.033 mg/L, while TCEQ’s screening level is 0.32 mg/L.

In segment 0610, NO2+NO3 nitrogen averaged between 0.03 and 0.81 mg/L (Table 4A-9). Data were collected at 18 stations from 1990 to 2002 for a total of 189 measurements. Of these, 168 samples exceeded EPA’s ecoregional reference values, while 91 samples exceeded TCEQ’s screening value for nitrate+nitrite nitrogen. The EPA’s 1974 Reservoir Assessment found mean values of 0.021 to 0.151 mg/L.

Segment 0615: Nitrate and Nitrite Nitrogen

In segment 0615, total NO2+NO3 nitrogen averaged between 0.23 and 0.65 mg/L (Table 4A-9). Data were collected at 4 stations from 1990 to 1997 for a total of 46 measurements. Of these, all 46 samples exceeded EPA’s ecoregional reference values, while 26 samples exceeded TCEQ’s screening value for nitrate+nitrite nitrogen. The EPA’s 1974 Reservoir Assessment found mean values of 0.021 to 0.151 mg/L.

Segment 0610 Total Kjeldahl Nitrogen

Total Kjeldahl nitrogen (TKN) measures the organic nitrogen fraction. EPA’s ecoregional reference value for reservoirs for TKN is 0.459 mg/L.

In segment 0610, TKN averaged between 0.33 and 1.03 mg/L (Table 4A-10). Data were collected at 5 stations from 1990 to 2002 for a total of 115 measurements. Of these, 87 samples exceeded EPA’s ecoregional reference value. EPA’s 1974 Reservoir Assessment found mean values of 0.462 to 0.554 mg/L.

June 2003 4-14 Historical Data Review for Sam Rayburn Reservoir

Segment 0615: Total Kjeldahl Nitrogen

In segment 0615, TKN averaged between 0.27 and 2.91 mg/L (Table 4A-10). Data were collected at 4 stations from 1993 to 2002 for a total of 109 measurements. Of these, 95 samples exceeded EPA’s ecoregional reference value. Compared to the 1974 Reservoir Assessment and segment 0610, TKN in segment 0615 is considerably higher.

Segment 0610: Ammonia Nitrogen

Ammonia nitrogen is a measure of the total fraction of ammonia ions in water, which are produced through the decomposition of proteins and other nitrogenous organic compounds. TCEQ’s screening value for total ammonia nitrogen is 0.106 mg/L.

In segment 0610, total ammonia nitrogen averaged between 0.02 and 0.19 mg/L (Table 4A-11). Data were collected at 20 stations from 1990 to 2002 for a total of 280 measurements. Of these, 66 samples exceeded TCEQ’s screening levels. EPA’s 1974 Reservoir Assessment found mean values of 0.049 to 0.201 mg/L. Segment 0610's mean ammonia nitrogen values fall within this range.

Segment 0615: Ammonia Nitrogen

In segment 0615, total ammonia nitrogen averaged between 0.04 and 1.28 mg/L (Table 4A-11). Data were collected at 4 stations from 1990 to 2002 for a total of 120 measurements. Of these, 47 samples exceeded the TCEQ’s screening level. Ammonia nitrogen in segment 0615 tended to be higher than that in segment 0610 based on these data.

Segment 0610: Biochemical Oxygen Demand

Biochemical oxygen demand (BOD) is a measure of the oxygen consumption used during the biochemical degradation of organic matter. Typically the higher the BOD, the higher the organic loads of materials that will undergo degradation.

BOD in segment 0610 averaged between 2 and 7 mg/L (Table 4A-12). Data were collected at six stations from 1999 to 2000 for a total of 20 measurements. Natural waters tend to have BODs ranging from 1 mg/L to 5 mg/L. Segment 0610's levels generally indicate a range not far from that of natural waters. There are no BOD criteria.

Segment 0615: Biochemical Oxygen Demand

BOD in segment 0615 ranged from 3 mg/L to 4 mg/L (Table 4A-12). Too few data points were available to determine an average for each station. Data were collected at three stations in 1999 for a total of 3 measurements. Natural waters tend to have BODs ranging from 1 mg/L to 5 mg/L. Segment 0610 levels generally indicate a range not far from that of natural waters. There are no BOD criteria.

June 2003 4-15 Historical Data Review for Sam Rayburn Reservoir

Segment 0610: Total Organic Carbon

There are no criteria or screening levels for organic carbon. Total organic carbon (TOC) is often measured because it provides insights on the amounts of allochthonous (inputs from outside the waterbody) and autochothonous (inputs from inside the waterbody) input to a water body. High TOC might also indicate large amounts of organic carbon undergoing degradation, a process that can ultimately affect dissolved oxygen concentrations.

TOC in segment 0610 averaged between 6 and 12 mg/L (Table 4A-13). Data were collected at five stations from 1990 to 2002 for a total of 127 measurements.

Segment 0615: Total Organic Carbon

Total organic carbon in segment 0615 averaged between 7.6 and 74 mg/L (Table 4A-13). Data were collected at four stations from 1990 to 2002 for a total of 117 measurements. These data show excessively high organic carbon concentrations relative to TOC values in segment 0610. Such high concentrations could be due to a direct source with high humic acids.

4.2.2.2 Metals and Dioxin

Aluminum

There are 107 records available for dissolved aluminum concentrations measured in the surface waters (0.3 m) of segment 0610 (period of record: August 1994-July 2002). The average dissolved aluminum concentration for all records is 152 µg/L. The minimum and maximum concentrations are <10 µg/L and 1,700 µg/L. Only three records exceed the Texas Water Quality Standards of 991 µg/L for dissolved aluminum. These exceedances occurred on August 20, 1996 (1,260 µg/L), March 03, 1997 (1,010 µg/L), and July 11, 2002 (1,700 µg/L) at stations 10615, 10613, and 15361, respectively. Table 4A-14 summarizes the available dissolved aluminum data for segment 0610.

For segment 0615, 61 water quality records collected from the Sam Rayburn Reservoir upstream of Paper Mill Creek (10623), Paper Mill Creek upstream of the confluence with the Sam Rayburn Reservoir (10502), and the Sam Rayburn Reservoir downstream of the confluence of Paper Mill Creek (10621) are available for dissolved aluminum. Table 4A-15 summarizes the dissolved aluminum data for these stations.

Dissolved aluminum criteria are based on a water-effects ratio (WER) (see Section 1.3). Recently, a WER of 8.39 developed by Champion International Corporation specifically for segments 0610 and 0615 was proposed and accepted by TCEQ. The EPA has approved the 8.39 WER for the segment 0615A mixing zone but has not approved the WER for segments 0615 and 0610. The TCEQ is currently evaluating a WER for segments 0615 and 0610. For the purposes of this data review, the WER was applied to segment 0615 and 0610. Applying the WER results in an acute dissolved aluminum criterion value of 8,310 µg/L. Using the new acute value, no exceedances are found in the available dissolved aluminum data for segments 0615 and 0610.

June 2003 4-16 Historical Data Review for Sam Rayburn Reservoir

Dissolved aluminum concentrations in surface waters at stations 15524, 15523, 10612, 15527, 15526, 14906, and 1552 in segment 0610 were all measured at concentrations less than 4.0 µg/L. Three stations—15523, 15527, and 14906— had less-than-detectable aluminum concentrations (< 2.0 µg/L) in October 2002.

There are 76 records available for aluminum in bottom sediments, measured at 13 stations in segment 0610 (period of record from August 16, 1994 to June 18, 2002). Summary statistics are as follows for the entire 76 samples: average, 21,283 mg/kg; minimum, 0.19 mg/kg; maximum, 79,300 mg/kg. When screened against a No Effects Level (NOEL) of 58,030 mg/kg (EPA 1996), three exceedances are revealed. Two exceedances occurred at station 14906 in August 2000 (79,300 mg/kg) and January 2002 (69,500 mg/kg); one exceedance occurred at station 10612 in January 2002 (59,400 mg/kg).

One record is available for aluminum in bottom sediments of segment 0615. This record is from station 16023 (Sam Rayburn Reservoir above Paper Mill Creek) and was collected on April 10, 1997, with a measured concentration of 4,410 mg/kg.

Data indicate that dissolved aluminum does not pose a water quality threat in Sam Rayburn Reservoir based on the following:

• Few records exceed the current water quality criteria for dissolved aluminum, and no records exceed the recently proposed water quality criterion of 8,310 µg/L.

• Ameliorating water quality factors are present in Sam Rayburn Reservoir waters to reduce potential effects of dissolved aluminum. This is supported by the WER, which indicates dissolved aluminum in laboratory water was approximately eight times more toxic than waters from the reservoir.

• Truly bioavailable (e.g., ionic) aluminum does not form at pHs above 5.5. The waters of Sam Rayburn Reservoir in general have considerably higher pH levels.

Arsenic

There are 106 records available for dissolved arsenic in surface waters of segment 0610 (period of record: July 1991 to March 2002). Sixty-one records (period of record: August 1995 to April 2002) are available for dissolved arsenic in surface waters of segment 0615. No exceedances of the acute or chronic TSWQS (390 µg/L and 190 µg/L) were observed.

Dissolved arsenic concentrations in surface waters at stations 15524, 15523, 10612, 15527, 15526, 14906, and 15522 in segment 0610 were all measured at detectable concentrations; however, all concentrations were less than 2.0 µg/L in October 2000. Table 4A-16 summarizes the dissolved arsenic concentrations observed in segments 0610 and 0615.

There are 101 arsenic concentration records available for bottom sediments, measured at 13 stations in segment 0610 (period of record of June 1974 to December 2002). Summary statistics

June 2003 4-17 Historical Data Review for Sam Rayburn Reservoir

are as follows for the entire 101 samples: average, 30.9 mg/kg; minimum, 0.33 mg/kg; maximum 90.1 mg/kg. When screened against a consensus-based threshold-effects concentration (TEC) of 9.79 mg/kg and a consensus-based probable effects concentration (PEC) of 33 mg/kg (MacDonald et al. 2000), 90 and 46 exceedances are revealed, respectively. Similar exceedances were found in TCEQ’s Sam Rayburn Reservoir Metals Study (2003).

One arsenic concentration (3.05 mg/kg) record is available for bottom sediment at station 10623 in April 1997, for segment 0615.

Copper

There are 112 records available for dissolved copper in surface waters for segment 0610 (period of record from July 1991 to July 2002). Table 5 of Procedures to Implement the TSWQS Guidance (TCEQ 2000) provides a 15th percentile hardness value for segment 0610 of 29.8 mg/L

as CaCO3. Copper criteria calculated using this value for segment 0610 are 4.4 µg/L (chronic) and 5.9 µg/L (acute). Of the 112 records, 40 exceed the chronic and acute criteria. However, 36 of the 40 samples that exceeded both the chronic and acute criteria were nondetects with detection limits of 6 µg/L. Table 4A-17 includes those detection records for segment 0610, which exceed the calculated chronic and acute criteria for dissolved copper. Table 4A-18 summarizes the available dissolved copper data for segment 0610.

There are 61 records available for dissolved copper in surface waters for segment 0615 (period of record from August 1995 to April 2002). Table 5 of Procedures to Implement the TSWQS Guidance (TCEQ 2000) provides a 15th percentile hardness value for segment 0615 of 29.8 mg/L as CaCO3. Copper criteria calculated using this value for segment 0615 are 4.4 µg/L (chronic) and 5.9 µg/L (acute). Of the 61 records, 37 exceed the calculated chronic and acute criteria. However, 28 of the 37 samples that exceeded both the chronic and acute criteria were non-detects with detection limits of 6 µg/L. An additional three samples were non-detects with detection limits of 11 µg/L and 25 µg/L. Table 4A-19 summarizes dissolved copper detections that exceed both the chronic and acute criteria for segment 0615. Table 4A-20 summarizes the available dissolved copper data for segment 0615. There are 99 copper concentration records available for bottom sediments, measured at 13 stations in segment 0610 (period of record: June 1974 to December 2002). Summary statistics are as follows for the 99 samples: average, 11.01 mg/kg; minimum, 1.48 mg/kg; maximum, 63 mg/kg. Two samples exceed a consensus-based threshold-effects concentration (TEC) of 31.6 mg/kg (MacDonald et al. 2000). These exceedances occurred at station 10613 (Sam Rayburn Reservoir at SH 103) on June 14, 1978 (32 mg/kg) and May 14, 1986 (63 mg/kg). No values exceeded the consensus-based PEC of 149 mg/kg (MacDonald et al. 2000).

One copper concentration (3.2 mg/kg) record is available for bottom sediment at station 10623 on segment 0615 in April 1997.

June 2003 4-18 Historical Data Review for Sam Rayburn Reservoir

Occasional exceedances of the copper crtieria occur in Sam Rayburn Reservoir waters. However, because the detection limits are often above water quality criteria, assessment of impairment based on the available data might not be representative of actual conditions. Recently, the Angelina and Neched River Authority (ANRA) instituted a Clean Metals Assessment Strategy. Data collected under this effort indicate that copper concentrations were all less than 0.3 µg/L.

Lead

There are 113 records available for dissolved lead in surface waters for segment 0610 (period of th record: July 1991 to July 2002). Using the 15 percentile hardness value (29.8 mg/L as CaCO3), the calculated chronic criterion for lead for segment 0610 is 0.54 µg/L and the acute criterion is calculated to be 15.54 µg/L. All records exceeded the calculated chronic criterion. However, 110 of the 113 samples that exceeded the chronic criterion were reported as nondetects with detection limits of 1 µg/L, 2 µg/L, or 3 µg/L. One sample from station 10613 collected on August 16, 1994, was reported as nondetect with a detection limit of 31 µg/L, exceeding the acute criterion of 15.54 µg/L. Table 4A-21 summarizes dissolved lead concentrations measured above the detection limits that exceed the chronic criterion for segment 0610. Table 4A-22 summarizes the available dissolved lead data for segment 0610.

There are 61 records available for dissolved lead in surface waters for segment 0615, with a period of record from August 1995 to April 2002. Using the 15th percentile hardness value (29.8 mg/L as CaCO3), the chronic criterion for lead is 0.54 µg/L and the acute criterion is 15.54 µg/L. All 61 observations exceeded the chronic criterion. However, 50 of these exceedances are nondetects with detection limits of 1 to 2 µg/L. No samples exceeded the acute criterion of 15.54 µg/L. Table 4A-23 summarizes dissolved lead concentrations measured above the detection limits that exceed the chronic criteria. Dissolved lead concentrations in surface waters at stations 15524, 15523, 10612, 15527, 15526, 14906, and 15522 in segment 0610 were all less than 0.1 µg/L in October 2002. Table 4-12 summarizes the available dissolved lead data for segment 0615.

There are 100 records available for lead in bottom sediments, from 13 stations in segment 0610 (period of record: June 1974 to December 2002). Summary statistics are as follows for the 100 samples: average, 19.49 mg/kg; minimum, 0.32 mg/kg; maximum, 84 mg/kg. Four samples exceed a consensus-based TEC of 35.8 mg/kg (MacDonald et al. 2000). These exceedances occurred at station 10612 (Sam Rayburn Reservoir at SH 147) on September 18, 2002 (45.5 mg/kg) and station 10613 (Sam Rayburn Reservoir at SH 103) on September 14, 1983 (38 mg/kg), June 11, 1984 (84 mg/kg), and May 24, 1988 (38 mg/kg). No values exceeded the consensus-based PEC of 128 mg/kg (MacDonald et al. 2000).

One lead concentration (5.58 mg/kg) record is available for bottom sediment at station 10623 in April 1997, for segment 0615.

June 2003 4-19 Historical Data Review for Sam Rayburn Reservoir

Selenium

Sixty records are available for total selenium in surface waters for segment 0610 (period of record: June 1989 to March 2002). No exceedances of the acute or chronic TSWQS (20 µg/L and 5 µg/L) were observed. All 60 records are reported as nondetects with the exception of one record from station 10615 on May 6, 1996 (2.38 µg/L). Table 4A-24 summarizes the available total selenium data for segment 0610.

There are 39 records available for total selenium in surface waters for segment 0615 (period of record: August 1996 to April 2002). All 39 records are reported as nondetects; however, the reporting limits for 5 records exceed the chronic TSWQS of 5 µg/L. These exceedances occurred at station 10502 on July 27, 1999 (5.5 µg/L) and January 13, 2000 (11 µg/L); station 10621 on February 17, 1998 (8 µg/L) and January 13, 2000 (11 µg/L); and station 10623 on February 17, 1998 (8 µg/L). No exceedances of the acute TSWQS for total selenium (20 µg/L) were observed. Table 4A-25 summarizes the available total selenium data for segment 0615.

Total selenium concentrations in surface waters at stations 15524, 15523, 10612, 15527, 15526, 14906, and 15522 in segment 0610 were all measured at less than 0.2 µg/L in October 2002. Stations 15524 and 15523 had detectable concentrations of 0.105 µg/L and 0.116 µg/L, respectively.

Zinc

There are 113 records available for dissolved zinc in surface waters for segment 0610 (period of th record: July 1991 to July 2002). Using the 15 percentile hardness value (29.8 mg/L as CaCO3), the calculated chronic criterion for zinc for segment 0610 is 37.5 µg/L and the acute criterion is 41.0 µg/L. One record exceeded the chronic criterion. This exceedance occurred at station 10613 on July 30, 1991 (40 µg/L). Table 4A-26 summarizes the available dissolved zinc data for segment 0610.

There are 61 records available for dissolved zinc in surface waters for segment 0615 (period of record: August 1995 to April 2002). Using the 15th percentile hardness value (29.8 mg/L as

CaCO3), a calculated chronic criterion for dissolved zinc for segment 0615 is 37.5 µg/L and the acute criterion is calculated to be 41.0 µg/L. There were nine exceedances of the calculated chronic criteria. Seven of these exceedances also exceeded the acute criterion. Table 4A-27 summarizes dissolved zinc detections that exceeded the chronic criterion for segment 0615, when using the 15th percentile hardness value of 29.8 mg/L. Dissolved zinc concentrations in surface waters at stations 15524, 15523, 10612, 15527, 15526, 14906, and 15522 in segment 0610 were all less than detection (< 0.5 µg/L) in October 2002. Table 4A-28 summarizes the available dissolved zinc data for segment 0615.

There are 101 zinc concentration records available for bottom sediments, measured at 13 stations for segment 0610 (period of record: June 1974 to December 2002). Summary statistics are as follows for the entire 101 samples: average, 96.18 mg/kg; minimum, 16.7 mg/kg; maximum, 620 mg/kg. When screened against the consensus-based TEC of 121 mg/kg (MacDonald et al. 2000),

June 2003 4-20 Historical Data Review for Sam Rayburn Reservoir

27 exceedances are revealed. These exceedances occurred at station 10612, 10613, 10615, 15523, 15524, 15525, and 15526. A single record at station 10613 (620 µg/L) exceeded the consensus-based PEC of 459 mg/kg (MacDonald et al. 2000).

One zinc concentration (31.5 mg/kg) record is available for bottom sediment at station 10623 in April 1997, for segment 0615.

Dioxin

The TRACS database was queried for dioxin and dioxin-like compounds, including furans. No records containing ambient concentration data for surface waters, sediments, or fish tissues were found.

4.2.2.3 Bacteria

Bacteria, specifically fecal coliform bacteria and E. coli, are measured for the protection of human health. These counts provide an estimate of contamination due to discharges of human wastes or animal waste, and they indicate the potential presence of pathogens. TCEQ standards indicate that fecal coliform bacteria levels should not exceed the instantaneous criterion of 400 counts/100 mL. E. coli should not exceed the instantaneous criterion of 394 counts/100 mL.

Segment 0610: Fecal Coliform Bacteria

In segment 0610, average fecal coliform bacteria ranged from 1.0 counts/100 mL to 857 counts/100 mL (Table 4A-29). Data were collected at 30 stations from 1990 to 2002 for a total of 470 measurements. Of these, 36 samples exceeded TCEQ’s criterion. It is important to note that the highest concentrations of fecal coliform bacteria were measured in the riverine sections of Ayish Bayou.

Segment 0615 - Fecal Coliform Bacteria

In segment 0615, average fecal coliform bacteria ranged from 173 counts/100 mL to 671 counts/100 mL (Table 4A-29). Data were collected at three stations from 1990 to 2002 for a total of 130 measurements. Of these, 20 samples exceeded TCEQ’s criterion.

Segment 0610: Escherichia Coli

In segment 0610, average E. coli ranged from 1.0 counts/100 mL to 156 counts/100 mL (Table 4A-30). Data were collected at 11 stations from 2001 to 2002 for a total of 135 measurements. Of these, one sample exceeded TCEQ’s criterion.

June 2003 4-21 Historical Data Review for Sam Rayburn Reservoir

Segment 0615: Escherichia Coli

In segment 0615, average E. coli ranged from 701 counts/100 mL to 1,053 counts/100 mL (Table 4A-30). Data were collected at three stations during 2002 for a total of 10 measurements. Of these, four samples exceeded TCEQ’s criterion.

4.2.2.4 Conventional Parameters

Segment 0610: Alkalinity

In segment 0610, total alkalinity average concentrations ranged from 16 mg/L to 48 mg/L (Table 4A-31). Data were collected at 5 stations from 1990 to 2002 for a total of 123 measurements. No criteria for alkalinity are promulgated for Texas and most other states. Given these concentrations, however, the buffering capacity of the reservoir is low.

Segment 0615: Alkalinity

In segment 0615, total alkalinity average concentrations ranged from 1 mg/L to 41 mg/L (Table 4A-31). Data were collected at 4 stations from 1990 to 2002 for a total of 120 measurements. Compared to segment 0610, alkalinity at several sites is very low and would reduce the water’s ability to neutralize additional positive hydrogen (H+) ions that may result from the addition of constituents that might lower the pH.

Segment 0610: Chloride

In segment 0610, total chloride average concentrations ranged from 5.2 mg/L to 52 mg/L (Table 4A-32). Data were collected at 17 stations from 1990 to 2002 for a total of 231 measurements. The TCEQ criterion for chloride in segment 0610 is 100 mg/L. It was exceeded only three times over the period of record.

Segment 0615: Chloride

In segment 0610, total chloride average concentrations ranged from 19.2 to 362 mg/L (Table 4A- 32). Data were collected at four stations from 1990 to 2002 for a total of 120 measurements. The TCEQ criterion for chloride in segment 0610 is 150 mg/L. This was exceeded 29 times over the period of record. Segment 0615's chlorides are considerably higher and more variable than those observed in Segment 0610.

Segment 0610: Sulfate

In segment 0610, sulfate average concentrations ranged from 5.3 mg/L to 41.8 mg/L (Table 4A- 33). Data were collected at 18 stations from 1990 to 2002 for a total of 231 measurements. The TCEQ criterion for sulfate in segment 0610 is 100 mg/L. This was exceeded two times over the period of record.

June 2003 4-22 Historical Data Review for Sam Rayburn Reservoir

Segment 0615: Sulfate

In segment 0615, sulfate average concentrations ranged from 25 mg/L to 245 mg/L (Table 4A- 33). Data were collected at four stations from 1990 to 2002 for a total of 131 measurements. The TCEQ criterion for sulfate in segment 0615 is 100 mg/L. This was exceeded 32 times over the period of record. Sulfate concentrations in segment 0615 are considerably higher than in segment 0610.

Segment 0610: Total Suspended Solids

In segment 0610, total suspended solids (TSS) average concentrations ranged from 1 mg/L to 19.9 mg/L (Table 4A-34). Data were collected at 15 stations from 1990 to 2002 for a total of 182 measurements. TCEQ has no criteria for TSS; however, these concentrations of TSS were relatively low.

Segment 0615: Total Suspended Solids

In segment 0615, TSS average concentrations ranged from 10 mg/L to 21.6 mg/L (Table 4A-34). Data were collected at four stations from 1990 to 2002 for a total of 119 measurements. Segment 0615 concentrations of TSS are relatively similar to those found in segment 0610.

Segment 0610: Total Dissolved Solids

In segment 0610, total dissolved solids (TDS) average concentrations ranged from 12 mg/L to 23 mg/L (Table 4A-35). Data were collected at 6 stations from 1994 to 2002 for a total of 120 measurements. TCEQ’s criterion for TDS is 400 mg/L, and 5 values exceeded this criterion. Clearly, these results differ from those observed for TSS, where concentrations were generally lower. Not all TDS concentrations are the result of paired samples (e.g., TSS and TDS samples collected together at a site).

Segment 0615: Total Dissolved Solids

In segment 0615, TDS average concentrations ranged from 179 mg/L to 1,218 mg/L (Table 4A- 35). Data were collected at 4 stations from 1994 to 2002 for a total of 105 measurements. TCEQ’s criterion for TDS is 500 mg/L in segment 0615, and 30 samples exceeded the criterion. Site 10502 had a maximum concentration of 2,660 mg/L. This concentration is noted because of its magnitude. Segment 0615 TDS concentrations are substantially higher than those observed in segment 0610. Although chloride and sulfate can make up large proportions of the TDS, concentrations of these parameters suggest that other factors influence the TDS in segment 0615.

Segment 0610: Water Temperature

Water temperature in a reservoir can be highly variable depending on the vertical depth at which the temperature is measured. Cooler, more dense waters are often located in the deeper portions of the reservoir or hypolimnion. Warmer temperatures (but not as warm as the surface

June 2003 4-23 Historical Data Review for Sam Rayburn Reservoir temperatures) are found in a middle layer called the metalimnion, and surficial layers called the epilimnion often very nearly reflect surficial temperatures, although this layer might be several meters thick. TCEQ’s criterion for water temperature in Sam Rayburn Reservoir is 33.9 °C. Because of the potential variability of temperature in a reservoir, the criterion is applied in Texas to surficial samples, and thus all data presented as part of this summary are for sampled collected about 1 foot below the surface.

In segment 0610, temperature averages ranged from 17 °C to 31 °C (Table 4A-36). Data were collected at 41 stations from 1990 to 2002 for a total of 668 measurements. Of these, 2 measurements exceeded the criterion.

Segment 0615: Water Temperature

In segment 0615, temperatures averages ranged from 20.9 °C to 23.8 °C (Table 4A-36). Data were collected at 3 stations from 1990 to 2002 for a total of 133 measurements. None of the measured temperatures exceeded the criterion.

Segment 0610: pH

Like dissolved oxygen, pH is regulated within the mixed surface layer. TCEQ’s pH criteria for segment 0610 are based on a range of 6.0 to 8.5. These criteria are applied to those waters depending on the location that may be considered surficial or several meters below the surface. For this reason, pH data presented and summarized in Table 4A-37 include all pH values measured at multiple depths for a site. Averages were calculated for a site and depth, resulting in more than 3,000 records. pH averages ranged from 5.9 to 8.1. Sixty-seven measurements exceeded either the lower or upper criteria limits. Assuming the thermocline is approximately 30 feet below the surface at many sites, and that the defined mixed surface layer is 30 feet or less, 39 pH values exceeded the criteria in this depth profile. Nineteen records exceeded the upper limit of 8.5, and 48 exceeded the lower limit of 6.0.

Segment 0615: pH

TCEQ’s pH criteria for segment 0615 are based on a range of 6.5 to 9.0. pH data for segment 0615 are presented and summarized in Table 4A-37, and they include all pH values measured at multiple depths for a site. Averages were calculated for a site and depth, resulting in 374 records. pH averages ranged from 6.45 to 7.65. Thirty-four measurements exceeded the lower or upper criteria limits. All pH values measured in this segment were at depths of less than about 12 feet. All 34 records exceeded the lower limit of 6.5.

Segment 0610: Conductivity

In segment 0610, conductivity averages ranged from 63.7 µmos/cm to 314 µmos/cm (Table 4A- 36). Data were collected at 30 stations from 1990 to 2002 for a total of 440 measurements.

June 2003 4-24 Historical Data Review for Sam Rayburn Reservoir

Segment 0615: Conductivity

In segment 0615, conductivity averages ranged from 168 µmos/cm to 1872 µmos/cm (Table 4A- 36). Data were collected at three stations from 1990 to 2002 for a total of 133 measurements. These conductivity data reflect the high TDS values observed in segment 0615.

4.2.3 Impairment Summary

This section presents a summary of all exceedances of the analyzed parameters in Sam Rayburn Reservoir. For more detailed information on the data see the following sections, which present detailed information for each of the pollutants. Summaries of the dissolved oxygen and metals impairments are presented first because DO and aluminum are the two parameters that the reservoir is listed for on the 303(d) list. A summary of the nutrient data is presented with the DO data because the two are often dependent on each other. Summaries of additional parameters analyzed at the request of TCEQ are presented after DO and metals.

Assessment of a number of parameters over a 10-plus year period in segment 0610 and 0615 indicates that a number of parameters exceed criteria or screening levels. Dissolved oxygen and metals tend to have low or no exceedances, whereas nutrients, chlorophyll a, and water transparency tend to have a number of high observations. Chlorides, sulfates, and TDS exceeded criteria, but more often in segment 0615 than in segment 0610. Bacteria exceedances also occur.

Dissolved Oxygen

In segment 0610, the lowest mean dissolved oxygen was calculated as 5.33 mg/L at station 15357. There were few criterion exceedances for these surficial samples (e.g., <3.0 mg/L); only two samples were measured as less than 3.0 mg/L. These exceedances were recorded at sites 15357 and 15358 in Ayish Bayou tributary streams (unclassified segment 0610a). Based on these data, no exceedances of the criteria were observed from sites within the reservoir portion of segment 0610.

Relatively few data were available for 24-hour average dissolved oxygen data for segment 0610. Two 24-hour average dissolved oxygen values exceeded the criterion (5.0 mg/L) at sites 14907 and 15361 in the Ayish Bayou arm of the reservoir. Only station 14907 is located within the reservoir. At station 14907 the 24-hour mean dissolved oxygen was 2.3 mg/L, while at station 15361 the 24-hour mean dissolved oxygen was 4.63 mg/L.

Overall, the depth profile data indicate that at the sites evaluated, dissolved oxygen stratification occurs during the summer months, resulting in hypolimnetic oxygen deficits. Mixed surface layers differ widely depending upon the time of year, but dissolved oxygen concentrations in this layer do not exceed the minimum criterion of 3.0 mg/L. Station 10613 is much less similar in profile to the other stations evaluated during the summer months; during the winter months, however, dissolved oxygen at all sites suggests the reservoir is well mixed and unstratified.

June 2003 4-25 Historical Data Review for Sam Rayburn Reservoir

Only three locations in segment 0615 had dissolved oxygen grab samples. Lower dissolved oxygen minima were found at these sites, with the lowest surficial grab sample recording a dissolved oxygen concentration of 1.9 mg/L. Over the period evaluated, a total of 19 sample measurements fell below the dissolved oxygen minimum criterion of 3.0 mg/L. This is a sharp contrast to segment 0610, which had only two dissolved oxygen concentrations below the minimum criterion.

The 24-hour dissolved oxygen average for sites in segment 0615 showed six sample means that fell below the 24-hour mean dissolved oxygen criterion of 5.0 mg/L. Stations 10621 and 10623 are on the Angelina River near Papermill Creek; station 10502 is in Papermill Creek.

Application of a mixed surface layer criterion for DO that is based on a net change of 0.5 °C in temperature provides a moving target to assess criterion exceedances. This evaluation examined DO in three different manners and found that overall, DO in the reservoir generally does not exceed criteria, however, the mixed surface layer at times is very shallow and does not constitute the full range of the epilimnion. Implications of this are that the DO may actually fall below criteria if the depth of the epilimnion were the basis for the assessment. Like many eutrophic reservoirs, periods of low DO are likely small, occurring during the pre-dawn hours when respiration is maximized.

Nutrients and Transparency

Nutrients, transparency, and chlorophyll a samples in the reservoir were compared to the available Texas nutrient screening levels and EPA’s reference criteria for lakes and reservoir since these parameters are often associated with depressed oxygen levels in waterbodies. Note that the screening levels and EPA’s reference criteria are not standards but only a benchmark used to indicate potential pollutant loadings to the reservoir. Chlorophyll a, total phosphorus, orthophosphorus, nitrate and nitrite, and ammonia all had data that were higher than the Texas nutrient screening levels for these parameters. There does not appear to be a strong difference in the number of high observations in segments 0610 and 0615. Secchi depth, chlorophyll a, total phosphorus, total nitrogen, nitrate and nitrite, and total kjeldahl nitrogen all had data in the reservoir that were higher than EPA’s nutrient reference criteria for lakes and reservoirs. The number of high observations was fairly large at both segments 0610 and 0615.

Measures of these parameters suggest, regardless of the screening criteria used, that the mechanisms for eutrophication in Sam Rayburn Reservoir are present. Comparison to the 1998 Texas Reservoir Assessment and EPA’s 1974 assessment of the reservoir indicate that for some parameters, present day concentrations are higher, possibly due to greater inputs from upstream point and non point sources. While higher nutrients and algal growth have not necessarily caused low DO consistently throughout the reservoir, these data do suggest that the conditions are present for nutrients to play a large role in oxygen dynamics of the reservoir and its tributaries.

June 2003 4-26 Historical Data Review for Sam Rayburn Reservoir

Metals and pH

Dissolved aluminum, dissolved copper, dissolved lead, and dissolved zinc all showed exceedances of criteria within the segments assessed. However, the number of exceedances was very small and high detection limits made much of the data unusable for assessing impairment. ANRA and TCEQ have instituted a new clean metals program with new, substantially lower detection limits. These data will provide the level of data integrity needed to evaluate whether metals in surface waters of the reservoir is an issue.

There were three dissolved aluminum exceedances of the 991 µg/L acute criterion segment 0610 and 21 exceedances on segment 0615.

There were 40 exceedances of the dissolved copper criterion in segment 0610 and 37 exceedances on segment 0615, but 36 and 28 observations were below detection limits, respectively. Compared to sample and time specific hardness, four and three samples, respectively, exceeded the chronic copper criterion during the assessment period.

There were values that exceeded the dissolved lead criterion, but most of these were reported as below detection limits (although concentrations were greater than the criteria). Three samples in segment 0610 were measured above the detection limits and exceeded the criterion in segment 0610. Likewise, in segment 0615, eight samples exceeded the criterion. For both segments, exceedances were of the chronic criterion.

In segment 0610, dissolved zinc showed only one exceedance at station 10613 on July 30, 1991. In segment 0615, all observations were nondetects. Comparison of the nondetected values to site and time specific hardness values shows that even though the measure below the detection limit is unknown, the detection limit does not exceed hardness measured at the time of sampling.

Overall, metals concentrations in surface waters have a relatively low potential to impair uses in segment 0610 and 0615. Numbers of exceedances for each metal parameter assessed are relatively low given the period for which the assessment was conducted. However, analytical detection limits hinder a proper assessment of long-term metals issues. Additional sampling, currently implemented by ANRA and TCEQ using lower detection limits, will aid in making a more accurate assessment of potential metals issues in these segments.

There were some exceedances of the pH criteria in segment 0610 and 0615. There were 19 high observations and 48 low observations in segment 0610, and 34 observations were below the lower threshold of 6.5 in segment 0615.

Bacteria

Thirty-six fecal coliform bacteria samples exceeded the 400 counts/100 mL criterion in segment 0610, which is approximately 8 percent of the samples. It is important to note that the highest concentrations of fecal coliform bacteria were measured in the riverine sections of Ayish Bayou. Twenty samples exceeded the criterion in segment 0615. There was only one exceedance of the

June 2003 4-27 Historical Data Review for Sam Rayburn Reservoir

E. coli criterion in segment 0610 and four exceedances of the E. coli criterion in segment 0615. The four exceedances on segment 0615 represented 40 percent of the samples in that portion of the reservoir. Continued monitoring at this and other sites is recommended to determine if there is a bacteria impairment.

Chloride and Sulfate

There were not many exceedances of the chloride and sulfate criteria in segment 0610 and 0615. There were three exceedances of chloride crition at segment 0610 and 29 exceedances at segment 0615. There were two sulfate exceedances at segment 0610 and 30 sulfate exceedances at segment 0615. Overall the chloride and sulfate observations exceeded the criteria more often in segment 0615 than in segment 0610.

Total Dissolved Solids

There were 5 exceedances of the TDS criterion in segment 0610 and 30 exceedances in segment 0615.

4.3 Sam Rayburn Reservoir STORET Water Quality

This section includes a summary and analysis of all of the water quality monitoring data available in EPA’s STORET database from 1990 through the present for the Sam Rayburn Reservoir (segment 0610). There were no data available in STORET for segment 0615. The summary includes only data collected from 1990 through the present even though additional data from prior to 1990 are available for many of the monitoring stations. Analysis of the more recent data results in a better understanding of the current conditions in the reservoir, which led to its placement on the 2000 section 303(d) list of impaired waters for the state of Texas.

4.3.1 STORET Monitoring Stations at Sam Rayburn Reservoir (Segment 0610)

A total of 51 monitoring stations in the STORET database have water quality data from Sam Rayburn Reservoir; however, only 14 stations have profile data from after 1990 (USGS and TCEQ stations). The 14 stations with recent profile data were the only stations analyzed for water quality trends in the watershed. There were no recent water quality data for any of the stations on segment 0615 (Angelina River/Sam Rayburn Reservoir). Table 4-2 presents the Sam Rayburn Reservoir monitoring stations in the watershed with post-1990 water quality data. Figure 4-5 shows the locations of the STORET stations in the watershed.

June 2003 4-28 Historical Data Review for Sam Rayburn Reservoir

Table 4-2. Water Quality Monitoring Stations in the Sam Rayburn Reservoir with Post- 1990 Data Segment ID Station ID Agency Station Name

14907 USGS Sam Rayburn Reservoir at FM 83

14906 USGS Sam Rayburn Reservoir at Main Pool

310437094065501 TCEQ Sam Rayburn Reservoir CC

310802094112201 TCEQ Sam Rayburn Reservoir FC

310816094041401 TCEQ Sam Rayburn Reservoir AC

311000094010301 TCEQ Sam Rayburn Reservoir LC

311039094141201 TCEQ Sam Rayburn Reservoir GC 0610 (Sam Rayburn Reservoir) 311137094051401 TCEQ Sam Rayburn Reservoir MC

311804094234901 TCEQ Sam Rayburn Reservoir JC

311817094190701 TCEQ Sam Rayburn Reservoir NC

311828094191801 TCEQ Sam Rayburn Reservoir IC

312216094280601 TCEQ Sam Rayburn Reservoir KC

06100100 USGS Sam Rayburn Reservoir

06100200 USGS Sam Rayburn Reservoir at SH 103

0615 (Angelina River/Sam There are no monitoring stations in EPA’s STORET database with recent Rayburn Reservoir) data for this segment

June 2003 4-29 Historical Data Review for Sam Rayburn Reservoir

31221609428060

06100200 S#

31181709419070 31180409423490 S#S# S# 31182809419180

S# 14907 Sam Rayburn 31113709405140 Reservoir 06100100 31100009401030 S# S# S# 31103909414120 31081609404140 S#

31080209411220 S# S#

S# 31043709406550 S# 14906

Reach File, Version 1 N Sam Rayburn Reservoir watershed

W E

Sources: EPA's BASINS S EPA's STORET

Figure 4-5. Location of STORET Water Quality Monitoring Stations in Sam Rayburn Reservoir

June 2003 4-30 Historical Data Review for Sam Rayburn Reservoir

4.3.2 Water Quality Data Analysis

Because Sam Rayburn Reservoir was placed on Texas’s 2000 section 303(d) list of impaired waterbodies for dissolved oxygen, pH, and aluminum impairments, these three parameters were analyzed for the reservoir. Any parameters that affect dissolved oxygen (i.e., nutrients and chlorophyll a) were also included in the analysis. Additional parameters were included in the analysis at the request of TCEQ to determine whether there are any other potential impairments of the reservoir. For parameters that have water quality criteria or screening levels, the number of exceedances was determined for each of the stations. Section 1.3 discusses the appropriate water quality criteria and screening levels. All stations were analyzed for the following parameters:

• Water temperature • Ammonia • Chloride • Transparency • Nitrate and nitrite • Sulfate • Conductivity • Total Kjeldahl • Dissolved arsenic • Dissolved oxygen nitrogen • Dissolved aluminum • Biolochemical • Total nitrogen • Dissolved copper oxygen demand • Phosphorus • Dissolved lead • pH • Total organic carbon • Total selenium • Total alkalinity • Chlorophyll a • Dissolved zinc • Total solids • Fecal coliform • Dioxin • Dissolved solids bacteria

4.3.2.1 Dissolved Oxygen and Nutrients

Dissolved Oxygen

The 14 monitoring stations on segment 0610 have a total of 645 dissolved oxygen observations. The lowest dissolved oxygen observation was 0.0 mg/L at station 06100100 on June 24, 1991, beginning at a depth of 30 feet and continuing to the bottom of the reservoir (56 feet). The maximum dissolved oxygen observation was 12.6 mg/L at station 310437094065501 on February 8, 1995, at between 10 and 30 feet.

Dissolved oxygen and pH criteria apply to the entire mixed water column, or to only measurements made in the mixed surface layer if the water column is stratified. For reservoirs, the mixed surface layer is defined as the portion of the water column from the surface to the depth at which water temperature decreases by greater than 0.5 °C (TNRCC 2002). Dissolved oxygen observations in the mixed layer were compared to the dissolved oxygen water quality criterion of 3.0 mg/L for grab samples on segment 0610. There was only one exceedance of the 3.0 mg/L dissolved oxygen criterion in the mixed layer of segment 0610. The exceedance occurred at station 14906 in August 1996. That exceedance occurred at the end of a severe drought with lower-than-normal reservoir levels (NCDC 2001). Table 4C-1 presents a summary of the dissolved oxygen data available for segment 0610. Figures 4D-2 through 4D-11 in Appendix 4D at the end of Section 4.0 present dissolved oxygen observations at representative stations in the reservoir at the upper, middle, and lower sections, as well as the Attoyac Bayou and Ayish Bayou arms of the reservoir.

June 2003 4-31 Historical Data Review for Sam Rayburn Reservoir

Chlorophyll a

There are 4 monitoring stations on segment 0610 with a total of 13 chlorophyll a observations. Nine of the observations are at the surface of the reservoir. The minimum chlorophyll a observation was 1.0 µg/L at station 06100200 on February 27, 1992. The maximum observation was 29.3 µg/L at station 14907 on August 21, 1996. The maximum observation at station 14907 is above the 21.4 µg/L screening level for chlorophyll a in Texas reservoirs. In comparison to the EPA reference conditions for chlorophyll a in lakes and reservoirs, seven observations are higher than the 2.834-µg/L reference conditions. The high concentrations occurred in August 1990, June and July 1991, February and July 1992, and August 1996. Table 4C-2 presents a summary of the available surface chlorophyll a data at segment 0610.

Transparency

Transparency was measured as Secchi disc depth for segment 0610. Twelve monitoring stations in segment 0610 have Secchi depth observations. The number of observations at each station ranges from 1 to 10. The minimum Secchi depth was measured as 0.20 meter at station 312216094280601 on February 14, 1997. The maximum Secchi depth of 2.7 meters was observed at three stations in the reservoir (310437094065501, 310802094112201, and 310816094041401) in August 1994. Secchi depth observations were compared to EPA’s reference conditions because Texas does not have Secchi depth criteria. There were 33 Secchi depth observations lower than the 1.1-meter Secchi depth reference conditions for Texas lakes and reservoirs. Table 4C-3 presents the Secchi depth data summary for segment 0610.

Nutrients

Total Phosphorus

There are 4 monitoring stations with a total of 17 total phosphorus observations in segment 0610. Eleven of those observations were at the surface of the reservoir and were compared to the total phosphorus criteria. The minimum total phosphorus observation was 0.01 mg/L at station 14906 on August 21, 1996, and the maximum observation was 0.18 mg/L at station 06100100 on July 16, 1992. No observations were higher than the 0.18-mg/L screening level for phosphorus in Texas reservoirs; however, the maximum observation at station 06100100 was right at the screening level. Ten observations were higher than the EPA reference conditions of 0.0325 mg/L for lakes and reservoirs. Table 4C-4 presents a summary of the total phosphorus data available for the surface of segment 0610.

Total Ortho-Phosphorus

There are two stations (14907 and 14906) on segment 0610 with total ortho-phosphorus observations at the surface of the reservoir, however, each station only has one observation. The ortho-phosphorus observations at stations 14907 and 14906 were both 0.1 mg/L on August 21, 1996. Both of these observations were higher than the 0.05 mg/L screening level for orthophosphorus in Texas reservoirs, however, the STORET remark code for both samples indicates

June 2003 4-32 Historical Data Review for Sam Rayburn Reservoir that the ortho-phosphorus value is known to be lower than the reported value. The detection limit used for sampling ortho-phosphorus was too high, resulting in observations that were greater than the applicable screening level. The ortho-phosphorus concentrations may actually be less than the screening level. Table 4C-5 presents a summary of the total ortho-phosphorus data available at the surface of segment 0610.

Total Nitrogen

Organic and inorganic nitrogen (NO2+NO3+NH4+TKN) were combined at all stations in segment 0610 containing those data types to calculate total nitrogen. Stations 06100100 and 06100200 had enough data to calculate total nitrogen concentrations at the surface of the reservoir and resulted in a total of four observations. The minimum observation, 0.47 mg/L, was at station 06100100 on June 24, 1991. The remaining three observations were all higher than the 0.492-mg/L lake and reservoir reference conditions (USEPA 2000). Table 4C-6 presents a summary of the total nitrogen data for the surface of segment 0610.

Nitrite and Nitrate

Two monitoring stations in segment 0610 have nitrite (NO2) and nitrate (NO3) observations. There is a total of 13 NO2+NO3 observations in segment 0610. Eight of those observations were at the surface of the reservoir and were compared to the Texas screening level and EPA’s reference conditions for NO2+NO3. The minimum concentration was 0.02 mg/L, which was observed at both stations on several dates (August 20, 1990, June 24, 1991, July 30,1991, and July 16, 1992). The maximum concentration, 0.14 mg/L, was observed on February 26, 1991, at station 06100200. The NO2 + NO3 observations were compared to the Texas screening level of 0.32 mg/L for nitrate and nitrite in Texas reservoirs as well as EPA’s reference condition of 0.033 mg/L. All observations were below the Texas screening level of 0.32 mg/L; however, four observations were higher than EPA’s reference concentration of 0.033 mg/L. Each of the three monitoring stations had high concentrations during February 1991 and February 1992. Table

4C-7 presents a summary of the surface NO2 + NO3 data available for segment 0610.

Total Kjeldahl Nitrogen

Segment 0610 had four monitoring stations with a total of 10 total Kjeldahl nitrogen (TKN) observations. Six of the observations were made at the surface of the reservoir and were compared to the reference conditions for TKN. The minimum observation was 0.45 mg/L at station 06100100 on February 26, 1991, and June 24, 1991. The maximum observation, 0.80 mg/L, was at station 06100200 on August 20, 1990. The TKN data were compared to EPA’s reference conditions of 0.459 mg/L for lakes and reservoirs. Four observations that were higher than the reference conditions. The high concentrations were observed at three stations in August 1990 and August 1996. Table 4C-8 presents a summary of the surface TKN data available for segment 0610.

June 2003 4-33 Historical Data Review for Sam Rayburn Reservoir

Ammonia

Nine monitoring stations have ammonia (un-ionized NH3) data for segment 0610. The 9 stations have a total of 154 ammonia observations. The minimum ammonia observation was 0.000005 mg/L at station 312216094280601 on February 14, 1997. The maximum ammonia observation was 0.015 mg/L at station 311828094191801 on August 22, 1996. The ammonia observations were compared to the screening-level for NH3 of 0.106 mg/L for Texas lakes and reservoirs. All ammonia observations were below the screening level concentration. Table 4C-9 presents a summary of the ammonia data in segment 0610.

Biological Oxygen Demand

There are no BOD5 data for segment 0610 in the STORET database.

Total Organic Carbon

Segment 0610 contains 17 total organic carbon (TOC) observations among 4 water quality monitoring stations. The minimum TOC observation was 5.0 mg/L at station 06100100 on July 16, 1992. The maximum TOC observation was 12.0 mg/L at station 06100200 on February 27, 1992. There are no TOC criteria to which the data can be compared. Table 4C-10 presents a summary of the available TOC data at segment 0610.

4.3.2.2 Metals and Dioxin

Metals

Metals data, including dissolved arsenic, dissolved copper, dissolved lead, total selenium, and dissolved zinc, were analyzed for segment 0610. There was only one monitoring station with metals data on segment 0610. The station had only 1 day of monitoring data for each of the metals. Arsenic, copper, lead, and zinc samples were collected on July 30, 1991, and one total selenium sample was collected on August 20, 1990. The station, 06100200, had no exceedances of any of the applicable metals water quality criteria (see Section 1.3). Table 4C-11 presents a summary of the available metals data for segment 0610.

Dioxin

There were no dioxin data for segment 0610 in the STORET database.

4.3.2.3 Fecal Coliform Bacteria

There are 7 stations with a total of 37 fecal coliform bacteria observations at the surface of segment 0610. The minimum observations were 0 counts/100 mL at stations 311828094191801 and 310437094065501 on January 26, 1994, and January 25, 1994, respectively. The maximum observed fecal coliform bacteria concentration, 220 counts/100 mL, was observed at station 311828094191801 on February 13, 1997. There were no exceedances of the 400 counts/100mL

June 2003 4-34 Historical Data Review for Sam Rayburn Reservoir fecal coliform bacteria instantaneous criterion in segment 0610. Table 4C-12 presents a summary of the available fecal coliform bacteria data at segment 0610.

4.3.2.4 Conventional Parameters

Total Alkalinity

There are seven monitoring stations with total alkalinity data in segment 0610. The 7 stations have a combined total of 53 total alkalinity observations. The minimum total alkalinity concentration of 8 mg/L was observed at station 06100100 on February 26, 1991. The maximum observed total alkalinity concentration was 59 mg/L at station 06100200 on August 20, 1990. There are no total alkalinity criteria to which the observed data can be compared. Table 4C-13 presents a summary of the total alkalinity data for segment 0610.

Chloride

There are 7 stations with 72 chloride observations at segment 0610. Thirty-nine of the observations are at the surface of the reservoir. The average chloride concentrations from surface samples at each monitoring station were compared to the chloride criterion. The minimum average chloride concentration was 9.5 mg/L at station 06100100 and the maximum average chloride concentration was 35.9 mg/L at station 312216094280601. There were no exceedances of the 100 mg/L chloride criterion for segment 0610. Table 4C-14 presents a summary of the available surface chloride data for segment 0610.

Sulfate

Segment 0610 contains 7 monitoring stations with a total of 72 sulfate observations. Thirty-eight of the observations are at the surface of the reservoir. The average sulfate concentrations at each of the monitoring stations were compared to the sulfate water quality criterion. The minimum average sulfate concentration was 12.0 mg/L at station 312216094280601; the maximum average concentration was 50.0 mg/L at station 31221609480601. There were no exceedances of the 100 mg/L sulfate criterion for segment 0610. Table 4C-15 presents a summary of the available surface sulfate data at segment 0610.

Total Suspended and Dissolved Solids

Four monitoring stations have total suspended solids (TSS) data for segment 0610. Total suspended solids are reported in the STORET database as total nonfiltered residue. The 4 stations have a combined total of 17 TSS observations. The minimum TSS value, 2.0 mg/L, was observed at station 06100100 on February 26, 1991, at 60 feet and in June 1991 and February 1992 at the surface of the reservoir. The maximum observed TSS value was 25.0 mg/L at station 14907 on August 21, 1996. There are no TSS criteria to which the data can be compared.

June 2003 4-35 Historical Data Review for Sam Rayburn Reservoir

Two stations on segment 0610 had total dissolved solids (TDS) data. Total dissolved solids are reported in the STORET database as dissolved residue. Each station had one observation on August 21, 1996. The minimum observation was 118.0 mg/L at station 14906, and the maximum observation was 144.0 mg/L at station 14907. There were no exceedances of the 400 mg/L TDS criterion for segment 0610. Table 4C-16 presents a summary of the TSS and TDS data for segment 0610.

Water Temperature

There are 645 water temperature observations for Sam Rayburn Reservoir, and 108 of them are surface samples that can be compared to the water quality criterion of 93.0 °F for surface water temperature. Each of the 14 stations with recent data for the reservoir have surface water temperature data. The minimum temperature, 48.2 °F, was observed at station 312216094280601 on January 27, 1994. The maximum temperature, 93.2 °F, was observed at station 311000094010301 on August 29, 1995. There was only one exceedance of the 93.0 °F temperature criterion for the Sam Rayburn Reservoir. Table 4C-17 presents a summary of the surface water temperature data available for segment 0610.

There are 644 pH observations for the 14 monitoring stations in segment 0610. The minimum pH value of 6.3 was observed at station 311000094010301 on April 20, 1994. The maximum observed pH value was 8.7 at station 311804094234901 on August 30, 1995. The observations were compared to the Texas pH criteria for segment 0610, which require a pH of 6 to 8.5 in the Sam Rayburn Reservoir. The pH criteria apply only to the mixed water column; therefore, if the water column is stratified, the criteria apply to the mixed area above the thermocline. There were two exceedances of the criteria, and both exceedances were just slightly higher than the upper threshold of 8.5 at the surface of the reservoir. Table 4C-18 presents a summary of the pH data at segment 0610.

Conductivity

All 14 monitoring stations in segment 0610 have conductivity observations (645 observations). The lowest conductivity observation was 85 µmos at station 311817094190701 on February 9, 1995, throughout the entire water column. The maximum conductivity observation was 435 µmos at station 312216094280601 on April 25, 1996, at the surface of the reservoir. There are no conductivity criteria for comparison to available water quality data. Table 4C-19 presents a summary of the conductivity data for segment 0610.

June 2003 4-36 Historical Data Review for Sam Rayburn Reservoir

4.3.3 Impairment Analysis

4.3.3.1 Impairment Summary (Based on STORET Data)

This section discusses any apparent impairments in the reservoir as well as any trends observed in the STORET data. More detailed information regarding the number of observations, minimum observation, maximum observation, average, and number of exceedances of the applicable criterion or target for each parameter is found in Section 4.3.2 and the tables in Appendix 4C.

Dissolved Oxygen

There were exceedances of the TWQS for dissolved oxygen on segment 0610. Dissolved oxygen as well as any other parameters that have an effect on DO (i.e., temperature, nutrients, transparency) were analyzed for segment 0610.

Overall, the dissolved oxygen concentrations tended to be very low in the hypolimnion of the reservoir during thermal stratification; however, the concentrations in the mixed layer of the epilimnion (where the dissolved oxygen criterion is applied) were usually above the 3.0 mg/L grab sample criterion. There was one exceedance of the 3.0 mg/L criterion in the mixed layer during August 1996. August 1996 was the end of a severe drought year and reservoir levels were unusually low. The exceedance occurred at station 14906, which is in the main pool of the reservoir near the dam. Although there were no additional exceedances of the DO criterion, the DO did get very low in the Attoyac Bayou and Ayish Bayou arms in August 1996 as well.

Low dissolved oxygen is often associated with increased water temperatures. There was only one exceedance of the temperature criterion during the period of record on an arm of the reservoir in August 1996. The temperature was only 0.2 °F higher than the criterion, and the reservoir levels were unusually low at the time because of a severe drought. High temperatures in the reservoir do not appear to be a problem since this was the only exceedance of the criterion out of 645 samples.

Nutrients and transparency samples in the reservoir were compared to the available Texas nutrient screening levels and EPA’s reference criteria for lakes and reservoirs since these parameters are often associated with depressed oxygen levels in waterbodies. Note that the screening levels and EPA’s reference criteria are not standards but only a benchmark used to indicate potential pollutant loadings to the reservoir. Chlorophyll a was the only parameter that had concentrations higher than the Texas screening levels for secondary concerns. The chlorophyll a concentration was very high during a sampling event in August 1996 on the Ayish Bayou arm, which coincides with the low dissolved oxygen observations and low reservoir levels at that time.

Secchi depth, nitrogen, phosphorus, and chlorophyll a all had concentrations higher than EPA’s reference criteria for nutrients. Several areas of the reservoir showed low Secchi depths. The largest numbers of low Secchi depth observations were observed at Attoyac Bayou and the upper portion of the reservoir just below segment 0615. Most other low observations were on the arms of the reservoir as well, except for three observations in the middle of the reservoir at station

June 2003 4-37 Historical Data Review for Sam Rayburn Reservoir

06100100. There does not seem to be any seasonal trend with the low Secchi observations.

There were 8 nitrite and nitrate samples in the early 1990s available for the middle and upper portions of the reservoir. Fifty percent of those samples were higher than the reference criteria, however, there are no more recent data to characterize current conditions in the reservoir. Four of the six TKN observations on the reservoir were higher than the reference conditions. Two of the observations were in the upper portion of the reservoir near segment 0615 in the early 1990s (August 1990 and February 1991). The two additional high observations were at the Ayish Bayou and the reservoir dam (main pool) stations in August 1996. These high concentrations coincide with the low dissolved oxygen and low reservoir levels at the time. There was also a significant amount of rain in August 1996 (see Section 3.4), after a long period drought. The rain may have provided a pathway to the reservoir for a large amount of nutrients that had accumulated in the watershed during the drought period. The only total nitrogen data available were from the early 1990s in the upper and middle portions of the reservoir. Three of four observations of total nitrogen were above the reference criteria with the highest observations being in the upper portion of the reservoir near segment 0615.

There were 11 total phosphorus observations available for segment 0610 and ten were higher than the reference criteria. Two of the observations were from August 1996 and the remaining observations were all from the early 1990s. There are no more recent data. One of the high observation was in August 1996 on the Ayish Bayou arm during a month with significant rainfall after a drought, and the remaining high observations were in the early 1990s in the middle and upper sections of the reservoir.

Two high chlorophyll a observations occurred in August 1996 at the Ayish Bayou arm and the reservoir dam, which also coincide with the low DO, high nutrient levels, low reservoir levels, and post-drought rainfall at this time. There were also 7 observations from the early 1990s in the middle and upper portions of the reservoir. Five of the 7 observations were higher than the reference criteria.

Overall, there were nutrient observations at only four stations in the reservoir during 1990, 1991, and August 1996. It is possible that the low dissolved oxygen and and increased nutrient loading in the reservoir were the result of a long drought period followed by significant amounts of rainfall in August 1996. The long dry period might have enabled nutrients to build up for a lengthy period of time on the land in the watershed and be washed off with the first large rainfall. However, because no long-term, continuous monitoring data were available in the STORET database, it was difficult to determine whether there were any consistent nutrient problems at particular times or areas in the reservoir.

pH and Metals

There were two slight exceedances of the upper limit of the pH criteria in August 1995 in the upper section of the reservoir and on the Attoyac Bayou arm. These were the only exceedances out of 644 pH observations in the reservoir.

June 2003 4-38 Historical Data Review for Sam Rayburn Reservoir

The STORET database contained very limited metals data for segment 0610. There were only five observations collected from five stations on two days in 1990 and 1991. None of these data showed exceedances of the applicable metals criteria for dissolved arsenic, dissolved copper, dissolved lead, total selenium, and dissolved zinc.

Fecal Coliform Bacteria

There were no exceedances of the fecal coliform bacteria criterion in segment 0610.

Chloride and Sulfate

There were no exceedances of the chloride or sulfate criteria in segment 0610.

June 2003 4-39 Historical Data Review for Sam Rayburn Reservoir

Appendix 4A Summary of TRACS Water Quality Monitoring Data for Sam Rayburn Reservoir

June 2003 4A-1 Table 4A-1. Summary of Surficial DO Grab Samples for Segments 0610 and 0615

Station Sample N < Segment ID ID Period Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 10612 2/26/1991 8/14/2002 0.3 00300 DO (mg/l) 6.5 11.7 8.73 52 610 10613 8/20/1990 12/10/2002 0.3 00300 DO (mg/l) 3.7 10.8 7.51 41 610 10614 10/28/1996 12/10/2002 0.3 00300 DO (mg/l) 3.9 10.2 7.95 21 610 14906 12/10/1996 8/22/2002 0.3 00300 DO (mg/l) 6.2 11.8 8.54 38 610 14907 8/21/1996 12/10/2002 0.3 00300 DO (mg/l) 4.5 11 7.64 24 610 15357 12/4/1996 8/19/1997 0.3 00300 DO (mg/l) 2.3 7.9 5.33 6 1 610 15358 12/4/1996 8/19/1997 0.3 00300 DO (mg/l) 2.7 9.4 6.07 6 1 610 15359 12/4/1996 8/19/1997 0.3 00300 DO (mg/l) 4.4 8.8 7.20 5 610 15360 12/4/1996 8/19/1997 0.3 00300 DO (mg/l) 3.7 9.6 6.63 7 610 15361 12/4/1996 8/7/2002 0.3 00300 DO (mg/l) 5 11.8 8.43 26 610 15362 11/12/1996 8/21/1997 0.3 00300 DO (mg/l) 6.6 10.1 8.11 7 610 15363 11/12/1996 8/21/1997 0.3 00300 DO (mg/l) 7.5 11.2 9.09 7 610 15364 11/12/1996 8/9/1996 0.3 00300 DO (mg/l) 6.5 10.8 8.28 9 610 15365 11/12/1996 8/21/1997 0.3 00300 DO (mg/l) 6 8.8 7.35 6 610 15366 11/12/1996 8/21/1997 0.3 00300 DO (mg/l) 6.4 10.9 8.67 7 610 15522 3/13/2001 8/22/2002 0.3 00300 DO (mg/l) 6.9 11.7 8.72 15 610 15523 3/8/2001 8/14/2002 0.3 00300 DO (mg/l) 6.8 13.2 8.48 15 610 15524 3/8/2001 8/14/2002 0.3 00300 DO (mg/l) 6.8 10.4 8.49 15 610 15526 3/13/2001 8/22/2002 0.3 00300 DO (mg/l) 6.8 11.4 8.62 15 610 15527 3/13/2001 8/22/2002 0.3 00300 DO (mg/l) 7.2 10.8 8.49 15 610 15666 1/26/1994 2/14/1996 0.3 00300 DO (mg/l) 5.4 10.8 8.53 7 610 15667 1/26/1994 2/14/1996 0.3 00300 DO (mg/l) 7.2 11.2 8.89 7 610 15668 1/27/1994 2/14/1996 0.3 00300 DO (mg/l) 5.9 10.3 8.17 7 610 15669 1/26/1994 2/14/1996 0.3 00300 DO (mg/l) 7.2 10.3 8.60 7 610 15670 1/26/1994 2/14/1996 0.3 00300 DO (mg/l) 6.9 11 8.90 7 610 15671 1/26/1994 2/14/1996 0.3 00300 DO (mg/l) 6.9 11 8.96 7 610 15672 1/25/1994 2/14/1996 0.3 00300 DO (mg/l) 6.9 12.5 9.80 7 610 15673 1/25/1994 2/13/1996 0.3 00300 DO (mg/l) 6.7 11.6 9.51 7 610 15674 1/25/1994 2/13/1996 0.3 00300 DO (mg/l) 6.4 11.9 8.73 7 610 15675 1/25/1994 2/13/1996 0.3 00300 DO (mg/l) 6.6 11.7 9.57 7 610 16784 6/1/1998 7/6/1999 0.3 00300 DO (mg/l) 5.6 9 7.78 9 610 16785 6/1/1998 7/6/1999 0.3 00300 DO (mg/l) 5.6 8 7.26 10 610 16786 6/1/1998 7/6/1999 0.3 00300 DO (mg/l) 6.5 8.1 7.71 10 610 16787 6/1/1998 7/6/1999 0.3 00300 DO (mg/l) 5.7 8.8 7.76 9 610 16788 5/6/1999 8/13/1999 0.3 00300 DO (mg/l) 5.9 9.7 7.26 9 610 16789 5/6/1999 8/13/1999 0.3 00300 DO (mg/l) 3.5 7.7 6.08 9 610 16790 5/6/1999 8/13/1999 0.3 00300 DO (mg/l) 6.3 8.6 7.80 9 610 16791 6/1/1998 7/6/1999 0.3 00300 DO (mg/l) 6.3 9.6 8.22 10 610 16792 5/6/1999 8/13/1999 0.3 00300 DO (mg/l) 4.8 8.7 7.33 9 610 16793 5/6/1999 8/13/1999 0.3 00300 DO (mg/l) 5.3 9.2 7.92 10 615 10502 6/25/1991 11/12/2002 0.3 00300 DO (mg/l) 1.9 9.7 4.11 33 14 615 10621 8/21/1990 11/12/2002 0.3 00300 DO (mg/l) 2.2 10 5.90 51 5 615 10623 6/25/1991 11/12/2002 0.3 00300 DO (mg/l) 4.1 10.6 6.87 49 Table 4A-2. Summary of 24-hour Minimum DO Data for Segments 610 and 615 Station Period Sample N < Segment ID ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 10614 9/18/2002 9/18/2002 0.49 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 7.6 7.6 7.6 1 610 10614 3/27/2001 3/27/2001 0.7 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 8.9 8.9 8.9 1 610 10614 6/19/2001 6/19/2001 1.1 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5.7 5.7 5.7 1 610 14907 3/27/2001 3/27/2001 0.6 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 2.3 2.3 2.3 1 1 610 14907 6/19/2001 6/19/2001 0.9 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 7.4 7.4 7.4 1 610 15361 5/16/2001 8/2/2001 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 4.62 6.37 5.495 2 1 615 10502 7/12/2000 7/12/2000 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 2.7 2.7 2.7 1 1 615 10502 4/12/2000 4/12/2000 0.4 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 7.3 7.3 7.3 1 615 10502 7/28/1999 8/15/2001 0.6 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 2.3 2.8 2.55 2 1 615 10502 5/23/2001 5/23/2001 0.7 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5.7 5.7 5.7 1 615 10502 6/16/1999 6/16/1999 0.8 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 4.2 4.2 4.2 1 1 615 10621 7/21/1998 7/21/1998 0.2 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 2.7 2.7 2.7 1 1 615 10621 7/27/1999 7/12/2000 0.6 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 4 4.2 4.1 2 1 615 10621 5/23/2001 5/23/2001 0.7 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 4.6 4.6 4.6 1 1 615 10621 4/11/2000 4/11/2000 0.8 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 6.6 6.6 6.6 1 1 615 10621 6/16/1999 8/15/2001 0.9 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 2.8 4.6 3.7 2 1 615 10621 5/5/1998 5/5/1998 1 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 6.1 6.1 6.1 1 1 615 10623 7/11/2000 7/11/2000 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5 5 5 1 615 10623 4/11/2000 4/11/2000 0.5 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 9.2 9.2 9.2 1 615 10623 7/21/1998 7/21/1998 0.6 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5.9 5.9 5.9 1 615 10623 4/22/1998 4/22/1998 0.7 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 6.9 6.9 6.9 1 615 10623 7/27/1999 7/27/1999 0.8 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5.2 5.2 5.2 1 615 10623 8/15/2001 8/15/2001 0.9 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 3.6 3.6 3.6 1 1 615 10623 4/20/1999 4/20/1999 1 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 8.2 8.2 8.2 1 Table 4-3. Summary of 24-hour Average DO Data for Segments 0610 and 0615 Station Period Sample N < Segment ID ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 10614 9/18/2002 9/18/2002 0.49 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 7.6 7.6 7.6 1 610 10614 3/27/2001 3/27/2001 0.7 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 8.9 8.9 8.9 1 610 10614 6/19/2001 6/19/2001 1.1 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5.7 5.7 5.7 1 610 14907 3/27/2001 3/27/2001 0.6 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 2.3 2.3 2.3 1 1 610 14907 6/19/2001 6/19/2001 0.9 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 7.4 7.4 7.4 1 610 15361 5/16/2001 8/2/2001 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 4.62 6.37 5.495 2 1 615 10502 7/12/2000 7/12/2000 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 2.7 2.7 2.7 1 1 615 10502 4/12/2000 4/12/2000 0.4 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 7.3 7.3 7.3 1 615 10502 7/28/1999 8/15/2001 0.6 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 2.3 2.8 2.55 2 1 615 10502 5/23/2001 5/23/2001 0.7 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5.7 5.7 5.7 1 615 10502 6/16/1999 6/16/1999 0.8 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 4.2 4.2 4.2 1 1 615 10621 7/21/1998 7/21/1998 0.2 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 2.7 2.7 2.7 1 1 615 10621 7/27/1999 7/12/2000 0.6 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 4 4.2 4.1 2 615 10621 5/23/2001 5/23/2001 0.7 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 4.6 4.6 4.6 1 615 10621 4/11/2000 4/11/2000 0.8 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 6.6 6.6 6.6 1 615 10621 6/16/1999 8/15/2001 0.9 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 2.8 4.6 3.7 2 1 615 10621 5/5/1998 5/5/1998 1 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 6.1 6.1 6.1 1 615 10623 7/11/2000 7/11/2000 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5 5 5 1 615 10623 4/11/2000 4/11/2000 0.5 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 9.2 9.2 9.2 1 615 10623 7/21/1998 7/21/1998 0.6 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5.9 5.9 5.9 1 615 10623 4/22/1998 4/22/1998 0.7 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 6.9 6.9 6.9 1 615 10623 7/27/1999 7/27/1999 0.8 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5.2 5.2 5.2 1 615 10623 8/15/2001 8/15/2001 0.9 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 3.6 3.6 3.6 1 1 615 10623 4/20/1999 4/20/1999 1 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 8.2 8.2 8.2 1 Table 4A-4. Summary of Chlorophyll a Data for Segments 0610 and 0615

Segment Storet N > ID Station ID Period Begin Period End Depth ID Parameter Min Max Avg N Criteria N >TCEQ 610 10612 6/24/1991 12/11/2002 0.3 32211 CHLOROPHYLL-A UG/L 1 23.1 6.52 33 23 1 610 10612 8/18/1994 8/18/1994 0.30488 32211 CHLOROPHYLL-A UG/L 7.48 7.48 7.48 1 1 610 10612 6/24/1991 6/24/1991 17.01 32211 CHLOROPHYLL-A UG/L 1.8 1.8 1.80 1 610 10613 8/20/1990 12/10/2002 0.3 32211 CHLOROPHYLL-A UG/L 1 20.8 6.10 36 21 610 10613 8/16/1994 8/16/1994 0.30488 32211 CHLOROPHYLL-A UG/L 28.4 28.4 28.40 1 1 1 610 10614 9/28/1999 12/10/2002 0.3 32211 CHLOROPHYLL-A UG/L 1 60.1 12.01 12 7 2 610 14906 8/21/1996 12/11/2002 0.3 32211 CHLOROPHYLL-A UG/L 1 6.94 2.67 21 8 610 14906 8/17/1999 8/17/1999 0.30488 32211 CHLOROPHYLL-A UG/L 2.14 2.14 2.14 1 610 14907 8/21/1996 12/10/2002 0.3 32211 CHLOROPHYLL-A UG/L 1 29.3 8.84 12 9 1 615 10621 8/21/1990 11/12/2002 0.3 32211 CHLOROPHYLL-A UG/L 1 16.4 3.55 40 13 615 10621 11/29/1994 12/4/1996 0.30488 32211 CHLOROPHYLL-A UG/L 1.82 13.4 7.61 2 1 615 10623 6/25/1991 11/12/2002 0.3 32211 CHLOROPHYLL-A UG/L 1 79.7 5.64 39 13 2 615 10623 11/29/1994 12/4/1996 0.30488 32211 CHLOROPHYLL-A UG/L 1.41 9.19 5.30 2 1 615 10502 6/25/1991 11/12/2002 0.3 32211 CHLOROPHYLL-A UG/L 1 34.2 3.35 33 33 615 10502 11/29/1994 12/4/1996 0.30488 32211 CHLOROPHYLL-A UG/L 3.45 4.34 3.90 2 1 2 615 10619 11/2/1995 11/2/1995 0.30488 32211 CHLOROPHYLL-A UG/L 3.41 3.41 3.41 1 1 Table 4A-5. Summary of Secchi Depth Data for Segments 0610 and 0615 Segment Station N > ID ID Period Begin Period End Storet ID Parameter Min Max Avg N Criteria 610 10612 2/26/1991 8/14/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.63 3 1.35 52 14 610 10613 2/26/1991 12/10/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.1 1.1 0.54 40 39 610 10614 9/28/1999 12/10/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.2 0.8 0.45 14 14 610 14906 11/24/1997 8/22/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 1.2 4 2.18 35 610 14907 8/21/1996 12/10/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.2 1.6 0.66 15 12 610 15361 10/21/1999 7/17/2001 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.3 0.5 0.36 8 8 610 15522 3/13/2001 8/22/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 1.2 3 1.89 14 610 15523 3/8/2001 8/14/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.5 1.5 1.05 15 11 610 15524 3/8/2001 8/14/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 1 2 1.33 15 8 610 15526 3/13/2001 8/22/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 1 3 2.10 15 1 610 15527 3/13/2001 8/22/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 1 2.1 1.63 15 2 610 15666 1/26/1994 4/21/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.4 1.45 0.89 18 14 610 15667 1/26/1994 4/17/1997 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.7 1.9 1.35 16 5 610 15668 1/27/1994 4/29/1998 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.2 1.8 0.68 17 16 610 15669 8/25/1994 8/26/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.42 1.3 0.89 15 10 610 15670 8/25/1994 8/26/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 1.1 2.48 1.71 15 610 15671 8/25/1994 8/26/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 1.12 2.7 1.72 14 610 15672 1/25/1994 4/17/1997 00078 TRANSPARENCY, SECCHI DISC (METERS) 1.3 2.7 1.91 18 610 15673 4/20/1994 8/25/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 1.3 2.7 1.83 15 610 15674 1/25/1994 4/20/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.9 2.4 1.50 17 2 610 15675 1/25/1994 8/25/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 1 2.35 1.60 18 2 615 10502 6/25/1991 11/12/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.08 2 0.24 34 33 615 10621 8/21/1990 11/12/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.1 0.6 0.27 53 53 615 10623 6/25/1991 11/12/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.1 0.8 0.41 46 46 Table 4A-6. Summary of Total Phosphorus Data for Segments 0610 and 0615

Station N > N Segment ID ID Period Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria >TCEQ 610 10612 2/26/1991 12/11/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.01 2.25 0.15 50 42 6 610 10612 8/18/1994 8/18/1994 0.30488 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.04 0.04 0.04 1 1 610 10612 6/24/1991 6/24/1991 17.01 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.11 0.11 0.11 1 610 10612 2/26/1991 2/26/1991 18.01 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.046 0.046 0.05 1 1 610 10613 8/20/1990 12/10/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.04 1.08 0.15 38 38 6 610 10613 8/16/1994 8/16/1994 0.30488 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.1 0.1 0.10 1 1 610 10613 8/20/1990 8/20/1990 5.79 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.094 0.094 0.09 1 1 610 10613 7/30/1991 7/30/1991 8.29 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.09 0.09 0.09 1 1 610 10613 2/26/1991 2/26/1991 10 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.062 0.062 0.06 1 1 610 10614 9/28/1999 12/10/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.06 0.17 0.10 12 12 610 14906 8/21/1996 12/11/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.01 0.77 0.10 36 26 4 610 14906 8/17/1999 8/17/1999 0.30488 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.03 0.03 0.03 1 610 14907 8/21/1996 12/10/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.05 0.12 0.07 13 13 610 15361 5/11/1999 7/17/2001 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.036 1.048 0.35 10 8 610 15522 3/13/2001 8/22/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.01 1.65 0.30 15 14 5 610 15523 3/8/2001 8/14/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.04 4.5 0.51 15 15 8 610 15524 3/8/2001 8/14/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.042 3.9 0.48 15 15 8 610 15526 3/13/2001 8/22/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.06 0.6 0.20 15 15 5 610 15527 3/13/2001 8/22/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.018 0.74 0.19 15 14 5 615 10502 6/25/1991 11/12/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.06 7.17 0.76 32 32 615 10502 11/29/1994 11/29/1994 0.30488 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.11 0.11 0.11 1 1 615 10619 11/2/1995 11/2/1995 0.30488 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.3 0.3 0.30 1 1 1 615 10621 8/21/1990 11/12/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.01 0.75 0.22 40 40 615 10621 11/29/1994 12/4/1996 0.30488 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.16 0.16 0.16 2 1 22 615 10623 6/25/1991 11/12/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.06 0.73 0.17 36 36 5 615 10623 11/29/1994 12/4/1996 0.30488 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.1 0.38 0.24 2 2 1 Table 4A-7. Summary of Orthophosphorus Data for Segments 0610 and 0615 Station N > Segment ID ID Period Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 10612 2/26/1991 8/14/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.001 0.266 0.05 25 5 610 10612 8/18/1994 8/18/1994 0.30488 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.01 0.01 1 610 10613 8/20/1990 11/24/1997 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.02 0.11 0.06 14 7 610 10613 8/16/1994 8/16/1994 0.30488 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.04 0.04 0.04 1 610 14906 11/24/1997 8/22/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.001 0.256 0.05 16 4 610 15361 10/21/1999 7/17/2001 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.024 0.582 0.20 8 1 610 15522 3/13/2001 8/22/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.001 0.312 0.05 15 2 610 15523 3/8/2001 8/14/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.001 0.79 0.09 15 3 610 15524 3/8/2001 8/14/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.012 0.54 0.09 15 4 610 15526 3/13/2001 8/22/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.001 0.195 0.05 15 5 610 15527 3/13/2001 8/22/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.001 0.111 0.03 15 4 610 15666 1/26/1994 2/14/1996 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.01 0.01 7 610 15666 8/26/1999 4/21/1999 0.3048 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.015 0.01 11 610 15667 1/26/1994 2/14/1996 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.01 0.01 7 610 15667 4/24/1996 4/17/1997 0.3048 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.011 0.01 10 610 15668 1/27/1994 2/14/1996 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.03 0.01 7 610 15668 8/21/1997 4/29/1998 0.3048 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.07 0.02 10 1 610 15672 4/20/1994 2/14/1996 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.01 0.01 6 610 15672 4/23/1996 4/17/1997 0.3048 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.011 0.01 11 610 15674 1/25/1994 2/13/1996 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.01 0.01 7 610 15674 8/25/1999 4/20/1999 0.3048 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.016 0.01 11 610 15675 1/25/1994 2/13/1996 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.01 0.01 7 610 15675 4/23/1996 8/25/1999 0.3048 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.011 0.01 11 615 10502 6/25/1991 7/9/1997 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.06 0.9 0.51 14 615 10502 11/29/1994 12/4/1996 0.30488 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.08 0.97 0.53 2 615 10619 11/2/1995 11/2/1995 0.30488 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.3 0.3 0.30 1 1 615 10621 2/22/1991 8/8/1995 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.06 0.32 0.16 13 13 615 10621 11/29/1994 12/4/1996 0.30488 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.13 0.14 0.14 2 2 615 10623 6/25/1991 11/2/1995 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.04 0.21 0.11 11 10 615 10623 11/29/1994 12/4/1996 0.30488 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.09 0.38 0.24 2 2 Table 4A-8. Summary of Total Nitrogen Data for Segment 0610 and 0615

Segment ID Station ID Period Begin Period End Parameter Min Max Avg N N> Criteria 610 10612 2/26/1991 11/24/1997 Total Nitrogen (mg/l) 0.48 0.9 0.6 9 8 610 10613 8/20/1990 11/24/1997 Total Nitrogen (mg/l) 0.43 5 1.096923077 13 11 610 14906 11/24/1997 11/24/1997 Total Nitrogen (mg/l) 0.4 0.4 0.4 1 615 10502 8/5/1993 7/9/1997 Total Nitrogen (mg/l) 0.46 13.3 4.785714286 14 13 615 10619 11/2/1995 11/2/1995 Total Nitrogen (mg/l) 2.8 2.8 2.8 1 1 615 10621 2/18/1993 12/4/1996 Total Nitrogen (mg/l) 0.59 5.39 1.626 10 10 615 10623 8/5/1993 12/4/1996 Total Nitrogen (mg/l) 0.45 8.87 1.631 10 8 Table 4A-9. Summary of Nitrate and Nitrite Nitrogen Data for Segments 0610 and 0615 Segment N > ID Station ID Period Begin Period End Storet ID Parameter Min Max Avg N Criteria N > TCEQ 610 10612 2/26/1991 8/14/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.01 2.1 0.36 26 22 9 610 10612 8/18/1994 8/18/1994 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.03 0.03 0.03 1 610 10613 8/20/1990 11/24/1997 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.02 0.6 0.11 14 9 1 610 10613 8/16/1994 8/16/1994 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.03 0.03 0.03 1 610 14906 11/24/1997 8/22/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.02 1.9 0.52 16 14 10 610 15357 11/7/1996 8/19/1997 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.6 0.40 4 4 2 610 15358 11/7/1996 8/19/1997 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.01 0.6 0.33 4 3 2 610 15359 11/7/1996 8/19/1997 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.8 0.43 4 4 2 610 15360 11/7/1996 8/19/1997 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.6 0.38 4 4 3 610 15361 11/7/1996 7/17/2001 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.01 3.2 0.81 19 18 13 610 15362 11/12/1996 8/21/1997 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 1 0.50 4 4 3 610 15363 11/12/1996 8/21/1997 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.4 0.25 4 4 1 610 15364 11/12/1996 8/19/1997 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.7 0.40 5 5 3 610 15365 11/12/1996 8/21/1997 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.9 0.45 4 4 2 610 15366 11/12/1996 8/21/1997 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.6 0.28 4 4 1 610 15522 3/13/2001 8/22/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.02 2.2 0.56 15 14 7 610 15523 3/8/2001 8/14/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 2 0.61 15 15 10 610 15524 3/8/2001 8/14/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 2 0.59 15 15 9 610 15526 3/13/2001 8/22/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.02 2.2 0.55 15 12 7 610 15527 3/13/2001 8/22/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.02 2.2 0.55 15 13 6 615 10502 6/25/1991 7/9/1997 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.88 0.49 14 16 10 615 10502 11/29/1994 12/4/1996 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.21 0.52 0.37 2 615 10619 11/2/1995 11/2/1995 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.4 0.4 0.40 1 1 1 615 10621 8/21/1990 8/8/1995 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.07 0.71 0.34 14 16 8 615 10621 11/29/1994 12/4/1996 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.11 0.34 0.23 2 615 10623 6/25/1991 11/2/1995 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.55 0.34 11 13 7 615 10623 11/29/1994 12/4/1996 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.07 1.22 0.65 2 Table 4A-10. Summary of Total Kjeldahl Nitrogen Data for Segments 0610 and 0615 Storet Segment ID Station ID Period Begin Period End ID Parameter Min Max Avg N N > Criteria 610 10612 2/26/1991 12/11/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.27 0.92 0.52 33 26 610 10613 8/20/1990 9/18/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.05 6.91 1.03 35 34 610 10613 8/16/1994 8/16/1994 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.64 0.64 0.64 1 610 10614 9/28/1999 9/17/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.34 1.09 0.72 11 8 610 14906 8/21/1996 12/11/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.28 1.33 0.47 21 7 610 14906 8/17/1999 8/17/1999 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.33 0.33 0.33 1 610 14907 8/21/1996 12/10/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.27 0.92 0.64 13 12 615 10502 8/5/1993 11/12/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.35 9.6 2.85 31 30 615 10502 11/29/1994 12/4/1996 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.1 0.43 0.27 2 615 10619 11/2/1995 11/2/1995 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 1.54 1.54 1.54 1 1 615 10621 2/18/1993 11/12/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.48 3.26 0.98 35 37 615 10621 11/29/1994 12/4/1996 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.78 0.98 0.88 2 615 10623 8/5/1993 11/12/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.29 0.91 0.57 36 27 615 10623 11/29/1994 12/4/1996 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.7 5.11 2.91 2 Table 4A-11. Summary of Total Ammonia Nitrogen Data for Segments 0610 and 0615 Station N > Segment ID ID Period Begin Period End Storet ID Parameter Min Max Avg N Criteria 610 10612 2/26/1991 12/11/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.55 0.07 50 8 610 10612 8/18/1994 8/18/1994 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.02 0.02 0.02 1 610 10613 8/20/1990 9/18/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 4.74 0.19 37 6 610 10613 8/16/1994 8/16/1994 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.04 0.04 0.04 1 610 10614 9/28/1999 9/17/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.05 0.08 0.05 11 610 14906 8/21/1996 12/11/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.67 0.07 36 6 610 14906 8/17/1999 8/17/1999 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.05 0.05 0.05 1 610 14907 8/21/1996 12/10/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.14 0.07 13 3 610 15357 11/7/1996 8/19/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.36 0.16 4 3 610 15358 11/7/1996 8/19/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.2 0.10 4 2 610 15359 11/7/1996 8/19/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.24 0.14 4 3 610 15360 11/7/1996 8/19/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.18 0.12 4 2 610 15361 11/7/1996 7/17/2001 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.32 0.07 19 5 610 15362 11/12/1996 8/21/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.17 0.07 4 1 610 15363 11/12/1996 8/21/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.09 0.05 4 610 15364 11/12/1996 8/19/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.26 0.12 5 2 610 15365 11/12/1996 8/21/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.16 0.09 4 2 610 15366 11/12/1996 8/21/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.14 0.07 4 1 610 15522 3/13/2001 8/22/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.39 0.08 15 5 610 15523 3/8/2001 8/14/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.348 0.09 15 5 610 15524 3/8/2001 8/14/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.19 0.06 14 4 610 15526 3/13/2001 8/22/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.84 0.11 15 4 610 15527 3/13/2001 8/22/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.64 0.10 15 4 615 10502 6/25/1991 11/12/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 5.02 1.24 33 25 615 10502 11/29/1994 12/4/1996 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.02 0.1 0.06 2 615 10619 11/2/1995 11/2/1995 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.86 0.86 0.86 1 1 615 10621 8/21/1990 11/12/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 1.69 0.28 41 20 615 10621 11/29/1994 12/4/1996 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.32 0.17 2 615 10623 6/25/1991 11/12/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.09 0.04 39 1 615 10623 11/29/1994 12/4/1996 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 2.54 1.28 2 Table 4A-12. Summary of Biochemical Oxygen Demand Data for Segments 0610 and 0615

Segment ID Station ID Period Begin Period End Depth Storet ID Parameter Min Max Avg N N > Criteria 610 10612 9/27/1999 3/8/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 3 3 3 3 NA 610 10613 9/28/1999 3/7/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 3 10 5.3 3 NA 610 10614 9/28/1999 3/7/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 4 10 7 2 NA 610 14906 9/27/1999 3/8/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 3 3 3 3 NA 610 14907 9/28/1999 3/7/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 4 10 7 2 NA 610 15361 11/17/1998 4/18/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.07 7 NA 615 10502 10/13/1999 10/13/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 4 4 4 1 NA 615 10621 10/13/1999 10/13/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 3 3 3 1 NA 615 10623 10/13/1999 10/13/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 3 3 3 1 NA Table 4A-13. Summary of Total Organic Carbon Data for Segments 0610 and 0615 Segment N > ID Station ID Period Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 10612 2/26/1991 12/11/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 4 11 7.49 35 NA 610 10612 8/18/1994 8/18/1994 0.30488 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 6 6 6.00 1 NA 610 10612 6/24/1991 6/24/1991 17.01 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 10 10 10.00 1 NA 610 10612 2/26/1991 2/26/1991 18.01 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 6 6 6.00 1 NA 610 10613 8/20/1990 12/10/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 5 24 11.74 38 NA 610 10613 8/16/1994 8/16/1994 0.30488 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 12 12 12.00 1 NA 610 10613 8/20/1990 8/20/1990 5.79 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 10 10 10.00 1 NA 610 10613 7/30/1991 7/30/1991 8.29 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 11 11 11.00 1 NA 610 10613 2/26/1991 2/26/1991 10 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 6 6 6.00 1 NA 610 10614 9/28/1999 12/10/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 3 10 6.25 12 NA 610 14906 8/21/1996 12/11/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 4 9 6.00 21 NA 610 14906 8/17/1999 8/17/1999 0.30488 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 6 6 6.00 1 NA 610 14907 8/21/1996 12/10/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 4 10 7.46 13 NA 615 10502 6/25/1991 11/12/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 5 135 71.66 32 NA 615 10502 11/29/1994 12/4/1996 0.30488 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 9 139 74.00 2 NA 615 10619 11/2/1995 11/2/1995 0.30488 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 30 30 30.00 1 NA 615 10621 8/21/1990 11/12/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 1 73 20.48 40 NA 615 10621 11/29/1994 12/4/1996 0.30488 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 21 21 21.00 2 NA 615 10623 6/25/1991 11/12/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 3 26 7.61 38 NA 615 10623 11/29/1994 12/4/1996 0.30488 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 10 123 66.50 2 NA Table 4A-14. Summary of Dissolved Aluminum Data for Segment 0610 Dissolved Aluminum (µg/L)

Station Start Date End Date Number of Minimu Maximu Number of Observation Average m m Exceedancesa s

10612 12/14/1995 3/14/2002 16 58.5 <25 161 0

10613 7/30/1991 3/13/2002 17 300 <25 1010 1

10614 9/28/1999 3/13/2002 11 185.5 39 378 0

10615 12/5/1995 8/20/1996 3 755 240 1260 1

14906 3/6/1996 3/14/2002 15 41.5 <25 79 0

14907 8/21/1996 1/17/2002 14 160 <25 691 0

15361 5/1/2001 7/11/2002 4 437.5 <10 1700 1

15522 3/6/1996 7/11/2002 5 38 <34 50 0

15523 12/6/1995 7/10/2001 5 37 <33 50 0

15524 12/6/1995 7/10/2001 4 60.5 <33 120 0

15525 12/5/1995 8/20/1996 3 94 <34 131 0

15526 12/7/1995 7/11/2001 5 40.6 <34 51 0

15527 3/6/1996 7/11/2001 5 39 34 50 0 a Exceedances of TWQS 991 µg/L.

Table 4A-15. Summary of Dissolved Aluminum Data for Segment 0615

Dissolved Aluminum (µg/L)

Station Start Date End Date Number of Minimu Maximu Number of Observation Average m m Exceedancesa s

10623 2/6/1997 4/29/2002 22 208.95 67 573 0

10502 8/9/1995 4/29/2002 17 2289.23 <26 3680 14

10621 8/8/1996 4/29/2002 22 889.85 222 3020 7 a Exceedances of TWQS 991 µg/L. Table 4A-16. Summary of Dissolved Arsenic Data for Segments 0610 and 0615 Station Start End Date Dissolved Arsenic (µg/L) Date Number of Average Minimum Maximum Number of Observations Exceedancesa

Segment 0610

10612 3/12/1996 3/14/2002 15 2.29 1 10 0

10613 7/30/1991 3/13/2002 21 4.62 1 34 0

10614 9/28/1999 3/13/2002 11 1.84 1 2.77 0

10615 12/5/1995 8/20/1996 4 3.8 3.3 4.56 0

14906 3/6/1996 3/14/2002 14 2.36 1 10 0

14907 8/21/1996 1/7/2002 14 2.21 1 3.55 0

15522 3/6/1996 7/11/2001 4 4.05 2 10 0

15523 12/6/1995 7/10/2001 5 3.99 2 10 0

15524 12/6/1995 7/10/2001 5 4.04 2 10 0

15525 12/5/1995 8/20/1996 4 4.48 2.67 6.63 0

15526 12/7/1995 7/11/2001 5 3.60 2 10 0

15527 3/6/1996 7/11/2001 4 4.1 2 10 0

Segment 0615

10502 8/9/1995 4/29/2002 17 4.38 1 10 0

10621 8/8/1996 4/29/2002 22 3.21 1 10 0

10623 2/6/1997 4/29/2002 22 2.47 1 8 0 a Exceedance of chronic or acute TWQS (190 µg/L and 390 µg/L).

Table 4A-17. Dissolved Copper Detections That Exceed Chronic and Acute Criteria for Segment 0610 Dissolved Sample Specific Sample Specific Criteria (µg/L) Station Date Copper Hardness (mg/L) (µg/L) Chronic Acute 14906 8/21/1996 8 29.2 4.3 5.8

15522 7/10/2001 6 NA NA NA

15523 7/10/2002 9 NA NA NA

15524 7/10/2001 9 NA NA NA Table 4A-18. Summary of Dissolved Copper Data for Segment 0610 Station Start Date End Date Dissolved Copper (µg/L)

Number of Average Minimum Maximum Number of Observations Exceedances a

10612 12/14/1995 3/14/2002 16 4.5 2 <6 7b

10613 7/30/1991 3/13/2002 21 4.4 <1 <6 8b

10614 9/28/1999 3/13/2002 11 4.9 <3 <6 7b

10615 12/5/1995 8/20/1996 4 4 <4 <4 0

14906 3/6/1996 3/14/2002 15 4.7 3 8 7c

14907 8/21/1996 1/17/2002 14 5 <3 <6 8b

15361 5/1/2001 7/11/2002 2 3.89 0.74 2 0

15522 3/6/1996 7/11/2002 5 4.4 <4 6 1

15523 12/6/1995 7/10/2001 5 5 <4 9 1

15524 12/6/1995 7/10/2001 5 5 <4 9 1

15525 12/5/1995 8/20/1996 4 4 <4 <4 0

15526 12/7/1995 7/11/2001 5 3.6 <2 <4 0

15527 3/6/1996 7/11/2001 5 3.8 3 <4 0 a Exceedances of calculated acute (5.9 µg/L) and chronic (4.4 µg/L) criteria for segment 0610. B Exceedances based on non-detects. C All but one exceedance based on non-detects.

Table 4A-19. Dissolved Copper Detections That Exceed Chronic and Acute Criteria for Segment 0615 Dissolved Sample Specific Sample Specific Criteria (µg/L) Station Date Copper Hardness (mg/L) (µg/L) Chronic Acute 10502 8/8/1996 21 117.7 14.1 21.5

10502 1/20/1999 19 138.1 16.2 25.0

10621 10/30/2001 17 41.6 5.8 8.1

10621 7/23/1998 6 67.3 8.8 12.7

10623 7/23/1998 6 35.9 5.1 7.0 Table 4A-20. Summary of Dissolved Copper Data for Segment 0615 Dissolved Copper (µg/L)

Number of Number of Station Start Date End Date Observations Average Minimum Maximum Exceedancesa

10502 8/9/1995 4/29/2002 17 8.82 3.98 <25 15b

10621 8/8/1996 4/29/2002 22 5.59 3 17 13b

10623 2/6/1997 4/29/2002 22 4.31 3 6 9c a Exceedances of calculated acute (5.9 µg/L) and chronic (4.4 µg/L) criteria for segment 0610. b All but two or three exceedances based on non-detects. c All but one exceedance based on non-detects.

Table 4A-21. Dissolved Lead Detections That Exceed Chronic Criteria for Segment 0610 Station Date Dissolved Sample Specific Sample Specific Criterion Lead Hardness (mg/L) (µg/L) (µg/L) Chronic Acute

10613 8/19/1993 4.86 38 0.74 21.2

10613 5/6/1996 1.31 45.3 0.92 26.5

15361 7/11/2002 1.21 NA NA NA Table 4A-22. Summary of Dissolved Lead Data for Segment 0610 Station Start Date End Date Dissolved Lead (µg/L)

Number of Average Minimum Maximum Number of Observations Exceedancesa

10612 12/14/1995 3/14/2002 16 1.25 <1 <2 16b

10613 7/30/1991 3/13/2002 21 2.87 <1 <31 21d

10614 9/28/1999 3/13/2002 11 1.27 <1 <2 11b

10615 12/5/1995 8/20/1996 4 1 <1 <1 4b

14906 3/6/1996 3/14/2002 15 1.26 <1 <2 15b

14907 8/21/1996 1/17/2002 14 1.14 <1 <2 14b

15361 5/1/2001 7/11/2002 3 1.14 1.21 <2 2c

15522 3/6/1996 7/11/2002 5 1.2 <1 <2 5b

15523 12/6/1995 7/10/2001 5 1.2 <1 <2 5b

15524 12/6/1995 7/10/2001 5 1.2 <1 <2 15b

15525 12/5/1995 8/20/1996 4 1 <1 <1 4b

15526 12/7/1995 7/11/2001 5 1.2 <1 <2 5b

15527 3/6/1996 7/11/2001 5 1.2 <1 <2 5b a Exceedances of the chronic criterion (0.54 µg/L) segment 0610. b Exceedances based on nondetects. c All but one exceedance based on nondetects. d All but two exceedances based on nondetects.

Table 4A-23. Dissolved Lead Detection That Exceed Chronic Criterion for Segment 0615 Station Date Dissolved Sample Sample Specific Criteria (µg/L) Lead Specific (µg/L) Hardness Chronic Acute (mg/L)

10502 8/8/1996 1.47 117.7 3.1 89.3

10502 10/21/1998 1.53 67.3 1.52 43.8

10502 4/10/2000 2.26 138.5 3.8 109.9

10502 7/11/2000 1.82 92.1 2.3 65.4

10502 10/25/2000 2.77 58.6 1.3 36.8

10621 7/23/1998 2.93 67.3 1.5 43.8

10621 7/11/2000 1.17 56.7 1.2 35.2

10621 10/25/2000 1.44 58.6 1.3 36.8 Table 4A-24. Summary of Dissolved Lead Data for Segment 0615 Station Start Date End Date Dissolved Lead (µg/L)

Number Avg Min Max Exceedancesa

10502 8/9/1995 4/29/2002 17 2.18 <1 <10 17d

10621 8/8/1996 4/29/2002 22 1.44 <1 <4 22c

10623 2/6/1997 4/29/2002 22 1.23 <1 <2 22b a Exceedances of calculated chronic (0.54 µg/L). b Exceedances based on nondetects. c All but three exceedances based on nondetects. d All but six exceedances based on nondetects.

Table 4A-25. Summary of Total Selenium Data for Segment 0610 Station Start Date End Date Total Selenium (µg/L)

Number of Average Minimum Maximum Number of Observations Exceedancesa

10612 12/14/1995 3/14/2002 8 1.41 <1 <2 0

10613 7/30/1991 3/13/2002 10 1.93 <1 <5 0

10614 9/28/1999 3/13/2002 5 1.06 <1 <1.1 0

10615 12/5/1995 8/20/1996 2 2.19 <2 2.38 0

14906 3/6/1996 3/14/2002 8 1.41 <1 <2 0

14907 8/21/1996 1/17/2002 5 1.44 <1 <2 0

15361 5/1/2001 7/11/2002 4 1.51 <0.04 <2 0

15364 8/19/1997 8/19/1997 11 5 <5 <5 0

15522 3/6/1996 7/11/2002 3 2 <2 <2 0

15523 12/6/1995 7/10/2001 3 2 <2 <2 0

15524 12/6/1995 7/10/2001 3 2 <2 <2 0

15525 12/5/1995 8/20/1996 2 2 <2 <2 0

15526 12/7/1995 7/11/2001 3 2 <2 <2 0

15527 3/6/1996 7/11/2001 3 2 <2 <2 0 a Exceedances of chronic and acute TSWQS for total selenium (5 µg/L and 20 µg/L, respectively). Table 4A-26. Summary of Total Selenium Data for Segment 0615 Station Start Date End Date Total Selenium (µg/L)

Number of Average Minimum Maximum Number of Observations Exceedancesa

10502 8/8/1996 2/7/2002 9 2.18 <1 <11 2b

10621 8/8/1996 4/29/2002 15 1.44 <1 <11 2b

10623 2/6/1997 4/29/2002 15 1.23 <1 <8 1b a Exceedances of chronic TSWQS for total selenium (5 µg/L). b Exceedances based on nondetects.

Table 4A-27. Summary of Dissolved Zinc Data for Segment 0610 Station Start Date End Date Dissolved Zinc (µg/L)

Number of Average Minimum Maximum Number of Observations Exceedancesa

10612 12/14/1995 3/14/2002 16 8.44 <3 31 0

10613 7/30/1991 3/13/2002 21 10.42 <3 40 1

10614 9/28/1999 3/13/2002 11 8 <8 <8 0

10615 12/5/1995 8/20/1996 4 5.5 <3 13 0

14906 3/6/1996 3/14/2002 15 7.47 <3 18 0

14907 8/21/1996 1/17/2002 14 7.86 <3 <22 0

15361 5/1/2001 7/11/2002 2 8.72 <1 21 0

15522 3/6/1996 7/11/2002 5 4.6 <3 11 0

15523 12/6/1995 7/10/2001 5 15.8 <3 35 0

15524 12/6/1995 7/10/2001 5 9.4 <3 34 0

15525 12/5/1995 8/20/1996 4 9.75 <3 28 0

15526 12/7/1995 7/11/2001 5 2.8 2 3 0

15527 3/6/1996 7/11/2001 5 3.2 3 4 0 1 Exceedance of calculated chronic criterion (37.5 µg/L) for segment 0610. Table 4A-28. Dissolved Zinc Detections for Segment 0615 That Exceed the Chronic or Acute Criteria Station Date Dissolved Sample Specific Sample Specific Criterion Zinc (µg/L) Hardness (mg/L) (µg/L)

Chronic Acute

10502 8/8/1996 38 117.7 131.4 119.9

10502 1/20/1999 51 138.1 150.5 137.4

10502 7/27/1999 39 103.4 117.7 107.5

10502 10/13/1999 47 110.3 124.4 113.6

10502 4/10/2000 52 138.5 150.8 137.7

10502 10/25/2000 52 102.3 116.7 106.5

10502 10/30/2001 42 115.6 129.4 118.2

Table 4A-29. Summary of dissolved zinc data for segment 0615 Station Start Date End Date Dissolved Zinc (µg/L)

Number of Average Minimum Maximum Number of Observations Exceedances a

10502 8/8/1996 2/7/2002 17 34.69 8 <100 8c

10621 8/8/1996 4/29/2002 22 16.36 5 <44 1b

10623 2/6/1997 4/29/2002 22 8.0 4 14.1 0 a Exceedances of chronic (37.5 µg/L) criterion for segment 0615. b Exceedance based on nondetect. c One exceedance based on nondetect. Table 4A-30. Summary of Fecal Coliform Bacteria Data for Segments 0610 and 0615

Segment ID Station ID Period Beg Period End Storet ID Parameter Min Max Avg N N > Criteria 610 10612 2/26/1991 8/14/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 6 2.51 49 610 10613 8/20/1990 12/10/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 290 28.66 38 610 10614 10/28/1996 12/10/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 3 780 120.59 22 2 610 14906 12/10/1996 8/22/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 4 2.00 35 610 14907 8/21/1996 12/10/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 2 1300 150.57 23 3 610 15357 11/7/1996 8/19/1997 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 70 740 354.44 9 4 610 15358 11/7/1996 8/19/1997 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 60 770 380.00 9 3 610 15359 11/7/1996 8/19/1997 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 30 1000 290.00 8 2 610 15360 11/7/1996 8/19/1997 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 20 650 269.00 10 3 610 15361 11/7/1996 8/7/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 2 590 163.52 29 2 610 15362 11/12/1996 8/21/1997 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 170 1000 503.33 9 5 610 15363 11/12/1996 7/14/1997 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 170 1400 598.75 8 4 610 15364 11/12/1996 8/19/1997 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 90 3100 857.00 10 4 610 15365 11/12/1996 8/21/1997 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 130 740 291.11 9 2 610 15366 11/12/1996 8/21/1997 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 30 450 197.14 7 1 610 15522 3/13/2001 8/22/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 1 1.00 14 610 15523 3/8/2001 8/14/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 7 1.57 14 610 15524 3/8/2001 8/14/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 6 1.36 14 610 15526 3/13/2001 8/22/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 2 1.07 15 610 15527 3/13/2001 8/22/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 6 1.73 15 610 16784 6/1/1998 7/6/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 2 320 75.86 14 610 16785 6/1/1998 7/6/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 55 11.05 19 610 16786 6/1/1998 7/6/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 66 14.33 18 610 16787 6/1/1998 7/6/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 180 28.00 19 610 16788 5/6/1999 8/13/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 800 130.00 7 1 610 16789 5/6/1999 8/13/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 2 26 14.14 7 610 16790 5/6/1999 8/13/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 21 8.71 7 610 16791 6/1/1998 7/6/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 64 14.17 18 610 16792 5/6/1999 8/13/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 29 13.57 7 610 16793 5/6/1999 8/13/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 580 102.57 7 1 615 10502 6/25/1991 11/12/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 7 13100 671.53 32 8 615 10621 8/21/1990 11/12/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 17 12200 591.08 51 7 615 10623 6/25/1991 7/9/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 10 1260 173.17 47 5 Table 4A-31. Summary of E.Coli Data for Segments 0610 and 0615

Segment ID Station ID Period Beg Period End Storet ID Parameter Min Max Avg N N > Criteria 610 10612 3/8/2001 8/14/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 1 4 1.47 19 610 10613 3/13/2002 12/10/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 2 125 36.50 4 610 10614 1/7/2002 12/10/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 2 290 85.60 5 610 14906 3/13/2001 8/22/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 1 2 1.33 18 610 14907 3/13/2002 12/10/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 2 240 76.00 4 610 15361 11/15/2000 8/7/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 62.7 416 159.81 10 1 610 15522 3/13/2001 8/22/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 1 2 1.13 15 610 15523 3/8/2001 8/14/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 1 10 1.94 15 610 15524 3/8/2001 8/14/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 1 12.2 2.01 15 610 15526 3/13/2001 8/22/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 1 2 1.07 15 610 15527 3/13/2001 8/22/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 1 7 2.22 15 615 10502 2/7/2002 11/12/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 102 2407 1053.33 3 2 615 10621 2/7/2002 11/12/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 99 2599 802.75 4 1 615 10623 2/7/2002 7/9/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 57 1961 701.33 3 1 Table 4A-32. Summary of Total Alkalinity Data for Segments 0610 and 0615 Segment Station N > ID ID Period Begin Period End Storet ID Parameter Min Max Avg N Criteria 610 10612 2/26/1991 12/11/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 8.0 40.0 20.6 35.0 NA 610 10612 8/18/1994 8/18/1994 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 20.0 20.0 20.0 1.0 NA 610 10613 8/20/1990 12/10/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 5.0 250.0 35.4 38.0 NA 610 10613 8/16/1994 8/16/1994 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 48.0 48.0 48.0 1.0 NA 610 10614 9/28/1999 12/10/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 10.0 34.0 23.3 12.0 NA 610 14906 8/21/1996 12/11/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 18.0 34.0 22.8 22.0 NA 610 14906 8/17/1999 8/17/1999 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 16.0 16.0 16.0 1.0 NA 610 14907 8/21/1996 12/10/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 21.0 48.0 30.7 13.0 NA 615 10502 6/25/1991 11/12/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 10.0 417.0 199.9 33.0 NA 615 10502 11/29/1994 12/4/1996 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 28.0 356.0 192.0 2.0 NA 615 10619 11/2/1995 11/2/1995 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 92.0 92.0 92.0 1.0 NA 615 10621 8/21/1990 11/12/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 14.0 213.0 56.5 41.0 NA 615 10621 11/29/1994 12/4/1996 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 34.0 54.0 44.0 2.0 NA 615 10623 6/25/1991 11/12/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 5.0 70.0 26.6 39.0 NA 615 10623 11/29/1994 12/4/1996 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 8.0 250.0 129.0 2.0 NA Table 4A-33. Summary of Chloride Data for Segments 0610 and 0615 N > Segment ID Station ID Period Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 10612 2/26/1991 12/11/2002 0.3 00940 CHLORIDE (MG/L AS CL) 4 30 15.35 35 610 10612 8/18/1994 8/18/1994 0.30488 00940 CHLORIDE (MG/L AS CL) 15 15 15.00 1 610 10613 8/20/1990 12/10/2002 0.3 00940 CHLORIDE (MG/L AS CL) 7 440 43.66 38 2 610 10613 8/16/1994 8/16/1994 0.30488 00940 CHLORIDE (MG/L AS CL) 52 52 52.00 1 610 10614 9/28/1999 12/10/2002 0.3 00940 CHLORIDE (MG/L AS CL) 6 15 10.25 12 610 14906 8/21/1996 12/11/2002 0.3 00940 CHLORIDE (MG/L AS CL) 12 19 14.59 22 610 14906 8/17/1999 8/17/1999 0.30488 00940 CHLORIDE (MG/L AS CL) 13 13 13.00 1 610 14907 8/21/1996 12/10/2002 0.3 00940 CHLORIDE (MG/L AS CL) 8 19 11.85 13 610 15357 11/7/1996 8/19/1997 0.3 00940 CHLORIDE (MG/L AS CL) 12.5 25 17.98 4 610 15358 11/7/1996 8/19/1997 0.3 00940 CHLORIDE (MG/L AS CL) 9 25.2 16.20 4 610 15359 11/7/1996 8/19/1997 0.3 00940 CHLORIDE (MG/L AS CL) 7 22.5 15.15 4 610 15360 11/7/1996 8/19/1997 0.3 00940 CHLORIDE (MG/L AS CL) 10.9 18 13.23 4 610 15361 11/7/1996 7/17/2001 0.3 00940 CHLORIDE (MG/L AS CL) 5.9 16.5 11.16 19 610 15362 11/12/1996 8/21/1997 0.3 00940 CHLORIDE (MG/L AS CL) 2.5 7.5 5.83 4 610 15363 11/12/1996 8/21/1997 0.3 00940 CHLORIDE (MG/L AS CL) 6 8.7 7.00 4 610 15364 11/12/1996 8/19/1997 0.3 00940 CHLORIDE (MG/L AS CL) 4 7.8 6.46 5 610 15365 11/12/1996 8/21/1997 0.3 00940 CHLORIDE (MG/L AS CL) 2.7 7.8 5.38 4 610 15366 11/12/1996 8/21/1997 0.3 00940 CHLORIDE (MG/L AS CL) 2.7 7 5.20 4 610 15667 1/26/1994 2/14/1996 0.3 00940 CHLORIDE (MG/L AS CL) 12 20 15.43 7 610 15667 4/24/1996 4/17/1997 0.3048 00940 CHLORIDE (MG/L AS CL) 13.994 30 18.48 10 610 15668 2/9/1995 2/9/1995 0 00940 CHLORIDE (MG/L AS CL) 12 12 12.00 1 610 15668 1/27/1994 2/14/1996 0.3 00940 CHLORIDE (MG/L AS CL) 10 53 33.71 7 610 15668 8/21/1997 4/29/1998 0.3048 00940 CHLORIDE (MG/L AS CL) 10.112 127.75 33.81 10 1 610 15672 4/20/1994 2/14/1996 0.3 00940 CHLORIDE (MG/L AS CL) 13 16 14.50 6 610 15672 4/23/1996 4/17/1997 0.3048 00940 CHLORIDE (MG/L AS CL) 12.33 21 16.18 11 615 10502 6/25/1991 11/12/2002 0.3 00940 CHLORIDE (MG/L AS CL) 8 639 320.58 33 20 615 10502 11/29/1994 12/4/1996 0.30488 00940 CHLORIDE (MG/L AS CL) 19 705 362.00 2 1 615 10619 11/2/1995 11/2/1995 0.30488 00940 CHLORIDE (MG/L AS CL) 147 147 147.00 1 615 10621 8/21/1990 11/12/2002 0.3 00940 CHLORIDE (MG/L AS CL) 4 341 76.49 41 7 615 10621 11/29/1994 12/4/1996 0.30488 00940 CHLORIDE (MG/L AS CL) 74 75 74.50 2 615 10623 6/25/1991 11/12/2002 0.3 00940 CHLORIDE (MG/L AS CL) 8 95 19.22 39 615 10623 11/29/1994 12/4/1996 0.30488 00940 CHLORIDE (MG/L AS CL) 23 442 232.50 2 1 Table 4A-34. Summary of Sulfate Data for Segments 0610 and 0615 N > Segment ID Station ID Period Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 10612 2/26/1991 12/11/2002 0.3 00945 SULFATE (MG/L AS SO4) 15 30 20.60 35 610 10612 8/18/1994 8/18/1994 0.30488 00945 SULFATE (MG/L AS SO4) 20 20 20.00 1 610 10613 8/20/1990 12/10/2002 0.3 00945 SULFATE (MG/L AS SO4) 11 263 41.83 38 2 610 10613 8/16/1994 8/16/1994 0.30488 00945 SULFATE (MG/L AS SO4) 33 33 33.00 1 610 10614 9/28/1999 12/10/2002 0.3 00945 SULFATE (MG/L AS SO4) 8 33 15.17 12 610 14906 8/21/1996 12/11/2002 0.3 00945 SULFATE (MG/L AS SO4) 15.9 23 18.46 22 610 14906 8/17/1999 8/17/1999 0.30488 00945 SULFATE (MG/L AS SO4) 16 16 16.00 1 610 14907 8/21/1996 12/10/2002 0.3 00945 SULFATE (MG/L AS SO4) 11 25 15.85 13 610 15357 11/7/1996 8/19/1997 0.3 00945 SULFATE (MG/L AS SO4) 16.55 30.7 22.64 4 610 15358 11/7/1996 8/19/1997 0.3 00945 SULFATE (MG/L AS SO4) 7.5 34.8 16.44 4 610 15359 11/7/1996 8/19/1997 0.3 00945 SULFATE (MG/L AS SO4) 18.5 27.57 24.02 4 610 15360 11/7/1996 8/19/1997 0.3 00945 SULFATE (MG/L AS SO4) 5.9 16.1 11.34 4 610 15361 11/7/1996 7/17/2001 0.3 00945 SULFATE (MG/L AS SO4) 4.61 45.9 22.50 19 610 15362 11/12/1996 8/21/1997 0.3 00945 SULFATE (MG/L AS SO4) 1 12 5.33 4 610 15363 11/12/1996 8/21/1997 0.3 00945 SULFATE (MG/L AS SO4) 23.2 42.24 29.59 4 610 15364 11/12/1996 8/19/1997 0.3 00945 SULFATE (MG/L AS SO4) 5.44 24.4 13.31 5 610 15365 11/12/1996 8/21/1997 0.3 00945 SULFATE (MG/L AS SO4) 4.78 10 7.87 4 610 15366 11/12/1996 8/21/1997 0.3 00945 SULFATE (MG/L AS SO4) 4.2 19.3 8.18 4 610 15667 1/26/1994 2/14/1996 0.3 00945 SULFATE (MG/L AS SO4) 14 21 17.86 7 610 15667 4/24/1996 4/17/1997 0.3048 00945 SULFATE (MG/L AS SO4) 15.62 31 20.52 10 610 15668 2/9/1995 2/9/1995 0 00945 SULFATE (MG/L AS SO4) 17 17 17.00 1 610 15668 1/27/1994 2/14/1996 0.3 00945 SULFATE (MG/L AS SO4) 12 46 26.43 7 610 15668 8/21/1997 4/29/1998 0.3048 00945 SULFATE (MG/L AS SO4) 13.148 50 24.59 10 610 15672 4/20/1994 2/14/1996 0.3 00945 SULFATE (MG/L AS SO4) 14 18 16.17 6 610 15672 4/23/1996 4/17/1997 0.3048 00945 SULFATE (MG/L AS SO4) 15.99 23.218 18.25 11 615 10502 6/25/1991 11/12/2002 0.3 00945 SULFATE (MG/L AS SO4) 13 514 245.61 33 25 615 10502 11/29/1994 12/4/1996 0.30488 00945 SULFATE (MG/L AS SO4) 24 346 185.00 2 1 615 10619 11/2/1995 11/2/1995 0.30488 00945 SULFATE (MG/L AS SO4) 92 92 92.00 1 615 10621 8/21/1990 11/12/2002 0.3 00945 SULFATE (MG/L AS SO4) 13 205 62.66 41 5 615 10621 11/29/1994 12/4/1996 0.30488 00945 SULFATE (MG/L AS SO4) 50 52 51.00 2 615 10623 6/25/1991 11/12/2002 0.3 00945 SULFATE (MG/L AS SO4) 9 68 25.13 39 615 10623 11/29/1994 12/4/1996 0.30488 00945 SULFATE (MG/L AS SO4) 28 260 144.00 2 1 Table 4A-35. Summary of Total Suspended Solids Data for Segments 0610 and 0615

Segment ID Station ID Period Begin Period End Depth Storet ID Parameter Min Max Avg N N > Criteria 610 10612 2/26/1991 12/11/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 2 48 5.50 34 NA 610 10612 8/18/1994 8/18/1994 0.30488 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 1 1.00 1 NA 610 10612 6/24/1991 6/24/1991 17.01 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 7 7 7.00 1 NA 610 10612 2/26/1991 2/26/1991 18.01 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 2 2 2.00 1 NA 610 10613 8/20/1990 12/10/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 23 8.68 38 NA 610 10613 8/16/1994 8/16/1994 0.30488 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 9 9 9.00 1 NA 610 10613 8/20/1990 8/20/1990 5.79 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 19 19 19.00 1 NA 610 10613 7/30/1991 7/30/1991 8.29 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 5 5 5.00 1 NA 610 10613 2/26/1991 2/26/1991 10 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 7 7 7.00 1 NA 610 10614 9/28/1999 12/10/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 3 40 17.42 12 NA 610 14906 8/21/1996 12/11/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 19 3.36 22 NA 610 14906 8/17/1999 8/17/1999 0.30488 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 1 1.00 1 NA 610 14907 8/21/1996 12/10/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 3 28 12.92 13 NA 610 15357 11/7/1996 8/19/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 7 13 11.00 4 NA 610 15358 11/7/1996 8/19/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 2 12.5 7.75 4 NA 610 15359 11/7/1996 8/19/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 5 15.5 10.38 4 NA 610 15360 11/7/1996 8/19/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 3 10.6 6.15 4 NA 610 15361 11/7/1996 7/17/2001 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1.33 21.5 11.49 19 NA 610 15362 11/12/1996 8/21/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 3.5 24 14.33 3 NA 610 15363 11/12/1996 8/21/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 14.5 9.63 4 NA 610 15364 11/12/1996 8/19/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 14 8.20 5 NA 610 15365 11/12/1996 8/21/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 7.5 32 19.88 4 NA 610 15366 11/12/1996 8/21/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 16.7 9.93 4 NA 615 10502 6/25/1991 11/12/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 5 194 21.64 33 NA 615 10502 11/29/1994 12/4/1996 0.30488 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 10 11 10.50 2 NA 615 10619 11/2/1995 11/2/1995 0.30488 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 21 21 21.00 1 NA 615 10621 8/21/1990 11/12/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 4 108 19.38 40 NA 615 10621 11/29/1994 12/4/1996 0.30488 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 10 12 11.00 2 NA 615 10623 6/25/1991 11/12/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 4 38 14.41 39 NA 615 10623 11/29/1994 12/4/1996 0.30488 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 11 16 13.50 2 NA Table 4A-36. Summary of Total Dissolved Solids Data for Segments 0610 and 0615

Segment ID Station ID Period Begin Period End Storet ID Parameter Min Max Avg N N > Criteria 610 10612 8/18/1994 12/11/2002 70300 RESIDUE,TOTAL FILTRABLE (DRIED AT 180C) (MG/L) 80 244 111.34 29 610 10613 8/16/1994 12/10/2002 70300 RESIDUE,TOTAL FILTRABLE (DRIED AT 180C) (MG/L) 79 1630 240.35 31 4 610 10614 9/28/1999 12/10/2002 70300 RESIDUE,TOTAL FILTRABLE (DRIED AT 180C) (MG/L) 71 232 106.75 12 610 14906 8/21/1996 12/11/2002 70300 RESIDUE,TOTAL FILTRABLE (DRIED AT 180C) (MG/L) 71 124 93.00 23 610 14907 8/21/1996 12/10/2002 70300 RESIDUE,TOTAL FILTRABLE (DRIED AT 180C) (MG/L) 74 188 112.46 13 610 15361 11/17/1998 7/17/2001 70300 RESIDUE,TOTAL FILTRABLE (DRIED AT 180C) (MG/L) 82 4106 439.67 12 1 615 10502 6/8/1994 11/12/2002 70300 RESIDUE,TOTAL FILTRABLE (DRIED AT 180C) (MG/L) 86 2660 1218.03 32 23 615 10619 11/2/1995 11/2/1995 70300 RESIDUE,TOTAL FILTRABLE (DRIED AT 180C) (MG/L) 540 540 540.00 1 1 615 10621 6/8/1994 11/12/2002 70300 RESIDUE,TOTAL FILTRABLE (DRIED AT 180C) (MG/L) 107 1220 344.00 35 5 615 10623 6/8/1994 11/12/2002 70300 RESIDUE,TOTAL FILTRABLE (DRIED AT 180C) (MG/L) 79 1370 179.95 37 1 Table 4A-37. Summary of Water Temperature Data for Segments 0610 and 0615 Storet N > Segment ID Station ID Period Begin Period End Depth ID Parameter Min Max Avg N Criteria 610 10612 2/26/1991 8/14/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 7.4 32.8 21.81 52 610 10613 8/20/1990 12/10/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 7.6 33.4 21.38 41 610 10613 8/16/1994 8/16/1994 0.30488 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 31 31 31.00 1 610 10614 10/28/1996 12/10/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 6.3 34.6 18.89 22 1 610 14906 12/10/1996 8/22/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 8 32.1 21.92 38 610 14907 8/21/1996 12/10/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 6.5 32.3 20.04 25 610 15357 11/7/1996 8/19/1997 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10.8 26.6 18.43 8 610 15358 11/7/1996 8/19/1997 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10.8 27 18.30 8 610 15359 11/7/1996 8/19/1997 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10.4 27.7 17.11 7 610 15360 11/7/1996 8/19/1997 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10.4 27 19.04 9 610 15361 11/7/1996 8/7/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 8.6 27.2 17.48 29 610 15362 11/12/1996 8/21/1997 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10.8 26.1 18.11 8 610 15363 11/12/1996 8/21/1997 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 11.2 26.2 18.06 8 610 15364 11/12/1996 8/9/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 11.3 27.4 19.85 10 610 15365 11/12/1996 8/21/1997 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 11.5 26.6 19.07 7 610 15366 11/12/1996 8/21/1997 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 12.6 28.8 19.55 8 610 15522 3/13/2001 8/22/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10.7 30.6 23.73 15 610 15523 3/8/2001 8/14/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 11.5 30.8 24.25 15 610 15524 3/8/2001 8/14/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 14.8 31.9 24.42 15 610 15526 3/13/2001 8/22/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 12.5 30.3 23.96 15 610 15527 3/13/2001 8/22/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 13.4 31 24.34 15 610 15666 1/26/1994 2/14/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 11 31.5 20.36 7 610 15666 8/26/1999 4/21/1999 0.3048 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 9.5 32 22.36 11 610 15667 1/26/1994 2/14/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10.5 31.5 19.71 7 610 15667 4/24/1996 4/17/1997 0.3048 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10 31 22.00 10 610 15668 1/27/1994 2/14/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 9 31.5 20.36 7 610 15668 8/21/1997 4/29/1998 0.3048 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 9 32.5 21.20 10 610 15669 1/26/1994 2/14/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10 31.5 20.14 7 610 15669 4/24/1996 8/26/1999 0.3048 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10 32 22.14 11 610 15670 1/26/1994 2/14/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10 31 19.36 7 610 15670 4/24/1996 8/26/1999 0.3048 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10 31 21.45 11 610 15671 1/26/1994 2/14/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10 31.5 19.43 7 610 15671 4/24/1996 8/26/1999 0.3048 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10 31 21.27 11 610 15672 1/25/1994 2/14/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10 32 19.71 7 610 15672 4/23/1996 4/17/1997 0.3048 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10 31.5 21.45 11 610 15673 1/25/1994 2/13/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 11 31.5 20.21 7 610 15673 4/23/1996 8/25/1999 0.3048 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10 32 21.80 10 610 15674 1/25/1994 2/13/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 11.5 34 20.93 7 1 610 15674 8/25/1999 4/20/1999 0.3048 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10.5 32.5 22.55 11 610 15675 1/25/1994 2/13/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 12 33 21.00 7 610 15675 4/23/1996 8/25/1999 0.3048 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10 32.5 22.32 11 610 16784 6/1/1998 7/6/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 27.3 32.5 30.68 14 610 16785 6/1/1998 7/6/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 25.9 32.5 29.91 19 610 16786 6/1/1998 7/6/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 26.2 33.2 29.72 19 610 16787 6/1/1998 7/6/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 27.6 32.9 30.67 19 610 16788 5/6/1999 8/13/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 23.7 32.8 28.99 9 610 16789 5/6/1999 8/13/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 23.2 32.4 28.34 9 610 16790 5/6/1999 8/13/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 23.4 31.2 28.02 9 610 16791 6/1/1998 7/6/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 27.3 33.6 30.51 18 610 16792 5/6/1999 8/13/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 23.8 32.7 28.67 9 610 16793 5/6/1999 8/13/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 24.2 34 30.01 10 1 615 10502 6/25/1991 11/12/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 9.1 32.6 23.87 33 615 10621 8/21/1990 11/12/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 7.5 32.2 20.98 51 615 10623 6/25/1991 11/12/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 6.9 31.6 20.94 49 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 10612 2/26/1991 8/14/2002 0.3 00400 PH (STANDARD UNITS) 6.7 8.8 7.53 52 3 610 10612 2/27/1992 12/11/2002 1 00400 PH (STANDARD UNITS) 6.7 8.8 7.52 33 3 610 10612 2/26/1991 6/24/1991 1.01 00400 PH (STANDARD UNITS) 6.6 7.1 6.85 2 610 10612 7/16/1992 8/4/1993 1.52 00400 PH (STANDARD UNITS) 7.5 8.4 7.95 2 610 10612 2/27/1992 12/11/2002 2 00400 PH (STANDARD UNITS) 6.7 8.8 7.47 33 2 610 10612 2/26/1991 6/24/1991 2.01 00400 PH (STANDARD UNITS) 6.5 6.9 6.70 2 610 10612 2/26/1991 6/24/1991 2.99 00400 PH (STANDARD UNITS) 6.5 6.8 6.65 2 610 10612 2/27/1992 12/11/2002 3 00400 PH (STANDARD UNITS) 6.6 8.7 7.36 33 1 610 10612 7/16/1992 8/4/1993 3.05 00400 PH (STANDARD UNITS) 7.4 8.1 7.75 2 610 10612 2/26/1991 6/24/1991 3.99 00400 PH (STANDARD UNITS) 6.5 6.7 6.60 2 610 10612 2/27/1992 12/11/2002 4 00400 PH (STANDARD UNITS) 6.5 8.6 7.26 33 1 610 10612 7/16/1992 8/4/1993 4.57 00400 PH (STANDARD UNITS) 7.4 8 7.70 2 610 10612 2/26/1991 12/11/2002 5 00400 PH (STANDARD UNITS) 6.4 8.5 7.17 35 610 10612 2/26/1991 12/11/2002 6 00400 PH (STANDARD UNITS) 6.3 8 7.07 35 610 10612 7/16/1992 8/4/1993 6.1 00400 PH (STANDARD UNITS) 7.3 7.9 7.60 2 610 10612 2/27/1992 12/11/2002 7 00400 PH (STANDARD UNITS) 6 8 7.05 33 610 10612 2/26/1991 6/24/1991 7.01 00400 PH (STANDARD UNITS) 6.4 6.5 6.45 2 610 10612 7/16/1992 8/4/1993 7.62 00400 PH (STANDARD UNITS) 7.2 7.9 7.55 2 610 10612 2/26/1991 6/24/1991 7.99 00400 PH (STANDARD UNITS) 6.4 6.5 6.45 2 610 10612 2/27/1992 12/11/2002 8 00400 PH (STANDARD UNITS) 5.8 8 6.99 33 1 610 10612 2/26/1991 6/24/1991 8.99 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 2 610 10612 2/27/1992 12/11/2002 9 00400 PH (STANDARD UNITS) 5.8 8 6.97 33 1 610 10612 7/16/1992 8/4/1993 9.14 00400 PH (STANDARD UNITS) 6.9 7.7 7.30 2 610 10612 2/26/1991 12/11/2002 10 00400 PH (STANDARD UNITS) 5.8 8 6.90 35 1 610 10612 7/16/1992 8/4/1993 10.67 00400 PH (STANDARD UNITS) 6.8 7.4 7.10 2 610 10612 2/26/1991 12/11/2002 11 00400 PH (STANDARD UNITS) 5.8 8 6.87 35 1 610 10612 2/27/1992 12/11/2002 12 00400 PH (STANDARD UNITS) 5.7 8.1 6.88 32 1 610 10612 2/26/1991 6/24/1991 12.01 00400 PH (STANDARD UNITS) 6.4 6.5 6.45 2 610 10612 7/16/1992 8/4/1993 12.19 00400 PH (STANDARD UNITS) 6.8 7.4 7.10 2 610 10612 8/8/1996 8/8/1996 12.5 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 10612 2/27/1992 12/11/2002 13 00400 PH (STANDARD UNITS) 5.7 8.1 6.87 31 1 610 10612 2/26/1991 6/24/1991 13.01 00400 PH (STANDARD UNITS) 6.4 6.6 6.50 2 610 10612 7/16/1992 8/4/1993 13.72 00400 PH (STANDARD UNITS) 6.7 7.4 7.05 2 610 10612 2/26/1991 6/24/1991 13.99 00400 PH (STANDARD UNITS) 6.4 6.6 6.50 2 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 10612 2/27/1992 12/11/2002 14 00400 PH (STANDARD UNITS) 5.7 8.1 6.87 31 1 610 10612 2/26/1991 12/11/2002 15 00400 PH (STANDARD UNITS) 5.6 8.1 6.78 28 1 610 10612 7/16/1992 8/4/1993 15.24 00400 PH (STANDARD UNITS) 6.7 7.4 7.05 2 610 10612 11/24/1997 9/27/1999 15.5 00400 PH (STANDARD UNITS) 6.5 7.2 6.80 3 610 10612 2/26/1991 12/11/2002 16 00400 PH (STANDARD UNITS) 5.6 8 6.75 22 1 610 10612 6/22/1999 6/18/2002 16.5 00400 PH (STANDARD UNITS) 6.6 6.7 6.63 3 610 10612 7/16/1992 8/4/1993 16.76 00400 PH (STANDARD UNITS) 6.7 7.4 7.05 2 610 10612 2/18/1993 3/14/2002 17 00400 PH (STANDARD UNITS) 5.6 8 6.64 13 1 610 10612 2/26/1991 6/24/1991 17.01 00400 PH (STANDARD UNITS) 6.4 6.8 6.60 2 610 10612 4/22/1998 4/22/1998 17.5 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 10612 2/23/1995 6/19/2001 18 00400 PH (STANDARD UNITS) 5.5 6.8 6.40 7 1 610 10612 2/26/1991 6/24/1991 18.01 00400 PH (STANDARD UNITS) 6.4 6.9 6.65 2 610 10612 4/14/1997 6/19/2001 18.5 00400 PH (STANDARD UNITS) 6.6 6.7 6.67 3 610 10612 2/23/1995 4/2/2001 19 00400 PH (STANDARD UNITS) 6.2 6.7 6.40 3 610 10612 4/2/2001 4/2/2001 19.5 00400 PH (STANDARD UNITS) 6.3 6.3 6.30 1 610 10612 2/23/1995 2/23/1995 20 00400 PH (STANDARD UNITS) 6.2 6.2 6.20 1 610 10613 8/20/1990 12/10/2002 0.3 00400 PH (STANDARD UNITS) 5.8 8.4 7.20 40 1 610 10613 8/16/1994 8/16/1994 0.30488 00400 PH (STANDARD UNITS) 8.1 8.1 8.10 1 610 10613 2/27/1992 12/10/2002 1 00400 PH (STANDARD UNITS) 5.7 8.3 7.08 35 1 610 10613 8/20/1990 7/30/1991 1.01 00400 PH (STANDARD UNITS) 7 7.4 7.20 3 610 10613 7/15/1992 8/4/1993 1.52 00400 PH (STANDARD UNITS) 7.3 7.8 7.55 2 610 10613 2/27/1992 12/10/2002 2 00400 PH (STANDARD UNITS) 5.7 8.1 6.97 35 1 610 10613 8/20/1990 7/30/1991 2.01 00400 PH (STANDARD UNITS) 6.8 7.3 7.03 3 610 10613 8/20/1990 7/30/1991 2.99 00400 PH (STANDARD UNITS) 6.7 7.3 6.97 3 610 10613 2/27/1992 12/10/2002 3 00400 PH (STANDARD UNITS) 5.6 8.1 6.90 35 1 610 10613 7/15/1992 8/4/1993 3.05 00400 PH (STANDARD UNITS) 7.2 7.6 7.40 2 610 10613 8/20/1990 7/30/1991 3.99 00400 PH (STANDARD UNITS) 6.7 7.4 6.97 3 610 10613 2/27/1992 12/10/2002 4 00400 PH (STANDARD UNITS) 5.6 8 6.85 35 1 610 10613 9/18/2002 9/18/2002 4.5 00400 PH (STANDARD UNITS) 7.2 7.2 7.20 1 610 10613 7/15/1992 8/4/1993 4.57 00400 PH (STANDARD UNITS) 7.2 7.5 7.35 2 610 10613 8/20/1990 12/10/2002 5 00400 PH (STANDARD UNITS) 5.6 8 6.81 36 1 610 10613 1/29/1996 10/17/2001 5.5 00400 PH (STANDARD UNITS) 6.3 7.4 6.84 5 610 10613 8/20/1990 8/20/1990 5.79 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 10613 2/26/1991 12/10/2002 6 00400 PH (STANDARD UNITS) 5.6 8 6.77 29 1 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 10613 7/15/1992 8/4/1993 6.1 00400 PH (STANDARD UNITS) 7.1 7.4 7.25 2 610 10613 11/23/1998 11/23/1998 6.5 00400 PH (STANDARD UNITS) 6.2 6.2 6.20 1 610 10613 2/18/1993 12/10/2002 7 00400 PH (STANDARD UNITS) 5.5 8 6.69 24 1 610 10613 2/26/1991 7/30/1991 7.01 00400 PH (STANDARD UNITS) 6.6 7.6 7.10 2 610 10613 7/15/1992 7/15/1992 7.32 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 610 10613 7/10/1997 8/4/1998 7.5 00400 PH (STANDARD UNITS) 6.3 6.9 6.60 2 610 10613 8/4/1993 8/4/1993 7.62 00400 PH (STANDARD UNITS) 7.3 7.3 7.30 1 610 10613 2/26/1991 2/26/1991 7.99 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 10613 2/18/1993 12/10/2002 8 00400 PH (STANDARD UNITS) 5.5 7.9 6.61 16 1 610 10613 7/30/1991 7/30/1991 8.29 00400 PH (STANDARD UNITS) 7.6 7.6 7.60 1 610 10613 3/3/1997 3/13/2002 8.5 00400 PH (STANDARD UNITS) 6.1 7.1 6.77 3 610 10613 2/26/1991 2/26/1991 8.99 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 1 610 10613 2/22/1995 6/18/2001 9 00400 PH (STANDARD UNITS) 5.5 6.6 6.24 7 1 610 10613 5/16/1995 3/26/2001 9.5 00400 PH (STANDARD UNITS) 5.5 6.4 6.10 4 1 610 10613 2/26/1991 6/18/2001 10 00400 PH (STANDARD UNITS) 6.1 6.6 6.40 3 610 10613 2/18/1999 2/18/1999 10.5 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 1 610 10614 10/28/1996 12/10/2002 0.3 00400 PH (STANDARD UNITS) 6.4 8.1 7.08 22 610 10614 9/28/1999 12/10/2002 1 00400 PH (STANDARD UNITS) 6.3 8 6.92 12 610 10614 9/28/1999 12/10/2002 2 00400 PH (STANDARD UNITS) 6.2 7.8 6.69 12 610 10614 9/28/1999 12/10/2002 3 00400 PH (STANDARD UNITS) 6.1 7.7 6.61 11 610 10614 1/8/2001 1/8/2001 3.5 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 1 610 10614 3/26/2001 12/10/2002 4 00400 PH (STANDARD UNITS) 6.1 7.6 6.60 8 610 10614 12/10/2002 12/10/2002 4.5 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 10614 3/26/2001 9/17/2002 5 00400 PH (STANDARD UNITS) 6 7.6 6.66 7 610 10614 10/17/2001 10/17/2001 5.5 00400 PH (STANDARD UNITS) 6.2 6.2 6.20 1 610 10614 3/26/2001 3/13/2002 6 00400 PH (STANDARD UNITS) 6 7.6 6.77 3 610 10614 1/7/2002 3/13/2002 6.5 00400 PH (STANDARD UNITS) 6.7 7.6 7.15 2 610 10614 3/26/2001 3/26/2001 7 00400 PH (STANDARD UNITS) 6 6 6.00 1 610 10614 3/26/2001 3/26/2001 8 00400 PH (STANDARD UNITS) 6 6 6.00 1 610 10614 3/26/2001 3/26/2001 8.5 00400 PH (STANDARD UNITS) 6 6 6.00 1 610 14906 12/10/1996 8/22/2002 0.3 00400 PH (STANDARD UNITS) 6.5 8.4 7.35 37 610 14906 8/21/1996 12/11/2002 1 00400 PH (STANDARD UNITS) 5.9 8.2 7.29 20 1 610 14906 8/21/1996 12/11/2002 2 00400 PH (STANDARD UNITS) 5.8 8.2 7.26 20 1 610 14906 8/21/1996 12/11/2002 3 00400 PH (STANDARD UNITS) 5.8 7.9 7.20 20 1 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 14906 8/21/1996 12/11/2002 4 00400 PH (STANDARD UNITS) 5.8 7.8 7.15 20 1 610 14906 8/21/1996 12/11/2002 5 00400 PH (STANDARD UNITS) 5.8 7.8 7.08 20 1 610 14906 8/21/1996 12/11/2002 6 00400 PH (STANDARD UNITS) 5.8 7.7 7.01 19 1 610 14906 8/21/1996 12/11/2002 7 00400 PH (STANDARD UNITS) 5.8 7.7 6.96 19 1 610 14906 8/21/1996 12/11/2002 8 00400 PH (STANDARD UNITS) 5.8 7.6 6.93 19 1 610 14906 8/21/1996 12/11/2002 9 00400 PH (STANDARD UNITS) 5.8 7.6 6.90 19 1 610 14906 8/21/1996 12/11/2002 10 00400 PH (STANDARD UNITS) 5.8 7.6 6.85 19 1 610 14906 8/21/1996 12/11/2002 11 00400 PH (STANDARD UNITS) 5.8 7.6 6.80 19 1 610 14906 8/21/1996 12/11/2002 12 00400 PH (STANDARD UNITS) 5.8 7.6 6.78 19 1 610 14906 8/21/1996 12/11/2002 13 00400 PH (STANDARD UNITS) 5.8 7.6 6.76 19 1 610 14906 8/21/1996 12/11/2002 14 00400 PH (STANDARD UNITS) 5.8 7.6 6.76 19 1 610 14906 8/21/1996 12/11/2002 15 00400 PH (STANDARD UNITS) 5.8 7.6 6.76 19 1 610 14906 8/21/1996 12/11/2002 16 00400 PH (STANDARD UNITS) 5.8 7.6 6.76 19 1 610 14906 8/21/1996 12/11/2002 17 00400 PH (STANDARD UNITS) 5.8 7.6 6.76 19 1 610 14906 8/21/1996 3/14/2002 18 00400 PH (STANDARD UNITS) 5.8 7.3 6.72 18 1 610 14906 8/21/1996 3/14/2002 19 00400 PH (STANDARD UNITS) 5.8 7.2 6.71 18 1 610 14906 8/21/1996 1/8/2002 20 00400 PH (STANDARD UNITS) 5.8 7.2 6.69 17 1 610 14906 11/24/1997 11/24/1997 20.5 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 610 14906 8/21/1996 1/8/2002 21 00400 PH (STANDARD UNITS) 5.8 7.2 6.67 16 1 610 14906 10/10/2000 1/8/2002 21.5 00400 PH (STANDARD UNITS) 5.6 7.1 6.35 2 1 610 14906 8/21/1996 6/19/2001 22 00400 PH (STANDARD UNITS) 6.3 7.2 6.74 13 610 14906 12/16/1999 12/16/1999 22.5 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 14906 2/18/1998 4/2/2001 23 00400 PH (STANDARD UNITS) 6.3 7.2 6.72 10 610 14906 2/18/1998 4/2/2001 24 00400 PH (STANDARD UNITS) 6.3 7.2 6.76 8 610 14906 8/17/1999 8/17/1999 24.5 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 14906 2/18/1998 4/2/2001 25 00400 PH (STANDARD UNITS) 6.3 7 6.68 5 610 14906 11/23/1998 11/23/1998 25.5 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 14906 2/18/1998 4/2/2001 26 00400 PH (STANDARD UNITS) 6.7 7 6.85 2 610 14906 2/18/1998 2/18/1998 27 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 14907 8/21/1996 12/10/2002 0.3 00400 PH (STANDARD UNITS) 6.5 7.8 7.04 25 610 14907 8/21/1996 12/10/2002 1 00400 PH (STANDARD UNITS) 6.5 7.7 6.88 14 610 14907 8/21/1996 12/10/2002 2 00400 PH (STANDARD UNITS) 6.2 7.6 6.77 14 610 14907 9/28/1999 12/10/2002 3 00400 PH (STANDARD UNITS) 6 7.6 6.71 13 610 14907 12/15/1999 6/13/2000 3.5 00400 PH (STANDARD UNITS) 6.7 6.8 6.75 2 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 14907 9/28/1999 12/10/2002 4 00400 PH (STANDARD UNITS) 5.9 7.6 6.67 11 1 610 14907 9/28/1999 12/10/2002 4.5 00400 PH (STANDARD UNITS) 5.9 6.9 6.40 2 1 610 14907 3/26/2001 6/7/2002 5 00400 PH (STANDARD UNITS) 6 7.6 6.64 7 610 14907 3/13/2002 3/13/2002 5.5 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 14907 3/26/2001 1/7/2002 6 00400 PH (STANDARD UNITS) 6 7.6 6.68 4 610 14907 3/26/2001 10/17/2001 7 00400 PH (STANDARD UNITS) 5.9 6.9 6.40 2 1 610 14907 3/26/2001 3/26/2001 7.5 00400 PH (STANDARD UNITS) 5.9 5.9 5.90 1 1 610 14907 10/17/2001 10/17/2001 8 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 14907 10/17/2001 10/17/2001 9 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 14907 10/17/2001 10/17/2001 10 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 14907 10/17/2001 10/17/2001 11 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 14907 10/17/2001 10/17/2001 12 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 14907 10/17/2001 10/17/2001 13 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 14907 10/17/2001 10/17/2001 14 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 14907 10/17/2001 10/17/2001 15 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 14907 10/17/2001 10/17/2001 16 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 14907 10/17/2001 10/17/2001 17 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 14907 10/17/2001 10/17/2001 18 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 14907 10/17/2001 10/17/2001 19 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 14907 10/17/2001 10/17/2001 20 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 14907 10/17/2001 10/17/2001 21 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 14907 10/17/2001 10/17/2001 22 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 14907 10/17/2001 10/17/2001 23 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 14907 10/17/2001 10/17/2001 24 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15357 11/7/1996 8/19/1997 0.3 00400 PH (STANDARD UNITS) 6.7 7.1 6.88 8 610 15358 11/7/1996 8/19/1997 0.3 00400 PH (STANDARD UNITS) 6.6 7.1 6.83 8 610 15359 11/7/1996 8/19/1997 0.3 00400 PH (STANDARD UNITS) 6.6 7 6.81 7 610 15360 11/7/1996 8/19/1997 0.3 00400 PH (STANDARD UNITS) 6.6 7.3 6.88 9 610 15361 11/7/1996 8/7/2002 0.3 00400 PH (STANDARD UNITS) 6.4 7.7 7.07 29 610 15362 11/12/1996 8/21/1997 0.3 00400 PH (STANDARD UNITS) 7 7.6 7.21 7 610 15363 11/12/1996 8/21/1997 0.3 00400 PH (STANDARD UNITS) 6.8 7.8 7.24 8 610 15364 11/12/1996 8/9/1996 0.3 00400 PH (STANDARD UNITS) 6.5 7.3 7.01 10 610 15365 11/12/1996 8/21/1997 0.3 00400 PH (STANDARD UNITS) 6.3 7.2 6.81 7 610 15366 11/12/1996 8/21/1997 0.3 00400 PH (STANDARD UNITS) 7 8.7 7.36 8 1 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 15522 3/13/2001 8/22/2002 0.3 00400 PH (STANDARD UNITS) 7 8.4 7.48 15 610 15523 3/8/2001 8/14/2002 0.3 00400 PH (STANDARD UNITS) 6.6 8.8 7.47 15 1 610 15524 3/8/2001 8/14/2002 0.3 00400 PH (STANDARD UNITS) 6.7 8.7 7.44 15 2 610 15526 3/13/2001 8/22/2002 0.3 00400 PH (STANDARD UNITS) 6.9 8.5 7.47 15 610 15527 3/13/2001 8/22/2002 0.3 00400 PH (STANDARD UNITS) 6.7 8.3 7.50 15 610 15666 1/26/1994 2/14/1996 0.3 00400 PH (STANDARD UNITS) 6.6 8.5 7.20 7 610 15666 8/26/1999 4/21/1999 0.3048 00400 PH (STANDARD UNITS) 6.6 7.6 6.96 11 610 15666 1/26/1994 2/14/1996 3.03 00400 PH (STANDARD UNITS) 6.6 7.3 6.90 7 610 15666 4/24/1996 8/26/1999 3.048 00400 PH (STANDARD UNITS) 6.2 7.5 6.78 11 610 15666 1/26/1994 2/14/1996 6.06 00400 PH (STANDARD UNITS) 6.6 7.3 6.84 7 610 15666 8/22/1996 8/26/1999 6.096 00400 PH (STANDARD UNITS) 6.1 7.4 6.74 9 610 15666 4/24/1996 4/24/1996 6.7056 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 15666 9/3/1998 9/3/1998 7.3152 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15666 2/14/1996 2/14/1996 7.88 00400 PH (STANDARD UNITS) 7.2 7.2 7.20 1 610 15666 1/26/1994 1/26/1994 8.18 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15666 8/26/1999 8/26/1999 8.5344 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15666 8/25/1994 8/25/1994 8.79 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 15666 4/21/1994 8/30/1995 9.09 00400 PH (STANDARD UNITS) 6.4 7.3 6.78 4 610 15666 2/19/1998 2/24/1999 9.144 00400 PH (STANDARD UNITS) 6.4 6.5 6.45 2 610 15666 4/29/1998 4/29/1998 9.7536 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 15666 8/21/1997 8/21/1997 10.058 00400 PH (STANDARD UNITS) 6.1 6.1 6.10 1 610 15666 4/21/1999 4/21/1999 10.21 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 610 15666 4/21/1994 4/21/1994 10.3 00400 PH (STANDARD UNITS) 7.3 7.3 7.30 1 610 15666 4/17/1997 4/17/1997 10.668 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15666 2/19/1998 2/19/1998 11.277 00400 PH (STANDARD UNITS) 6.4 6.4 6.40 1 610 15666 2/24/1999 2/24/1999 11.43 00400 PH (STANDARD UNITS) 6.4 6.4 6.40 1 610 15666 4/19/1995 4/19/1995 11.82 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 1 610 15666 2/9/1995 2/9/1995 12.12 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15667 1/26/1994 2/14/1996 0.3 00400 PH (STANDARD UNITS) 6.7 8.6 7.43 7 1 610 15667 4/24/1996 4/17/1997 0.3048 00400 PH (STANDARD UNITS) 6.7 8 7.09 10 610 15667 1/26/1994 2/14/1996 3.03 00400 PH (STANDARD UNITS) 6.7 8.2 7.31 7 610 15667 4/24/1996 8/26/1999 3.048 00400 PH (STANDARD UNITS) 6.4 7.1 6.85 10 610 15667 1/26/1994 2/14/1996 6.06 00400 PH (STANDARD UNITS) 6.6 7.1 6.83 7 610 15667 4/24/1996 8/26/1999 6.096 00400 PH (STANDARD UNITS) 6.3 7.1 6.79 10 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 15667 9/3/1998 9/3/1998 7.0104 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15667 1/26/1994 2/14/1996 9.09 00400 PH (STANDARD UNITS) 6.5 7 6.74 7 610 15667 4/24/1996 8/26/1999 9.144 00400 PH (STANDARD UNITS) 6.1 7.1 6.69 10 610 15667 1/26/1994 2/14/1996 12.12 00400 PH (STANDARD UNITS) 6.6 6.9 6.79 7 610 15667 4/24/1996 8/26/1999 12.192 00400 PH (STANDARD UNITS) 6.4 7.1 6.73 10 610 15667 9/3/1998 9/3/1998 14.02 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15667 4/24/1996 8/22/1996 14.325 00400 PH (STANDARD UNITS) 6.4 7 6.70 2 610 15667 4/21/1994 8/30/1995 15.15 00400 PH (STANDARD UNITS) 6.6 6.8 6.72 5 610 15667 2/13/1997 8/26/1999 15.24 00400 PH (STANDARD UNITS) 6.4 7.1 6.64 7 610 15667 1/26/1994 2/14/1996 16.36 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 2 610 15667 8/25/1994 8/25/1994 16.97 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15667 8/26/1999 8/26/1999 17.068 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 15667 8/30/1995 8/30/1995 17.27 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15667 2/13/1997 2/13/1997 17.678 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 610 15667 4/21/1994 4/19/1995 18.18 00400 PH (STANDARD UNITS) 6.4 6.8 6.60 2 610 15667 8/21/1997 2/24/1999 18.288 00400 PH (STANDARD UNITS) 6.5 6.6 6.53 3 610 15667 4/21/1994 4/21/1994 18.79 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15667 4/17/1997 2/19/1998 18.897 00400 PH (STANDARD UNITS) 6.6 6.8 6.70 2 610 15667 2/9/1995 2/9/1995 19.7 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 15667 2/24/1999 2/24/1999 20.116 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15667 4/19/1995 4/19/1995 21.21 00400 PH (STANDARD UNITS) 6.4 6.4 6.40 1 610 15668 1/27/1994 2/14/1996 0.3 00400 PH (STANDARD UNITS) 6.4 8.5 7.14 7 610 15668 8/21/1997 4/29/1998 0.3048 00400 PH (STANDARD UNITS) 6.4 8.3 7.04 10 610 15668 8/30/1995 8/30/1995 1.52 00400 PH (STANDARD UNITS) 7.3 7.3 7.30 1 610 15668 9/2/1998 9/2/1998 1.8288 00400 PH (STANDARD UNITS) 7.7 7.7 7.70 1 610 15668 4/21/1994 2/14/1996 3.03 00400 PH (STANDARD UNITS) 6.4 7.3 6.85 6 610 15668 2/14/1997 8/25/1999 3.048 00400 PH (STANDARD UNITS) 6.4 8.2 6.96 7 610 15668 4/29/1998 4/29/1998 3.3528 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15668 4/17/1997 4/17/1997 4.572 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15668 4/25/1996 4/25/1996 5.4864 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 1 610 15668 1/27/1994 8/30/1995 6.06 00400 PH (STANDARD UNITS) 6.4 7.3 6.85 6 610 15668 4/17/1997 4/21/1999 6.096 00400 PH (STANDARD UNITS) 6.5 7 6.68 5 610 15668 2/14/1996 2/14/1996 6.36 00400 PH (STANDARD UNITS) 7.2 7.2 7.20 1 610 15668 8/25/1999 8/25/1999 6.4008 00400 PH (STANDARD UNITS) 8 8 8.00 1 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 15668 2/14/1997 2/14/1997 6.7056 00400 PH (STANDARD UNITS) 6.4 6.4 6.40 1 610 15668 8/25/1994 8/30/1995 7.58 00400 PH (STANDARD UNITS) 7.1 7.4 7.25 2 610 15668 8/21/1997 8/21/1997 7.9248 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15668 4/21/1999 4/21/1999 8.9916 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15668 4/21/1994 4/21/1994 9.09 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15668 4/17/1997 4/17/1997 9.144 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 15668 2/19/1998 2/19/1998 9.4488 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 1 610 15668 4/19/1995 4/19/1995 10.3 00400 PH (STANDARD UNITS) 6.4 6.4 6.40 1 610 15668 2/24/1999 2/24/1999 10.363 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15668 2/9/1995 2/9/1995 10.61 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 1 610 15669 1/26/1994 2/14/1996 0.3 00400 PH (STANDARD UNITS) 6.6 8.7 7.40 7 1 610 15669 4/24/1996 8/26/1999 0.3048 00400 PH (STANDARD UNITS) 6.5 7.9 7.17 11 610 15669 1/26/1994 2/14/1996 3.03 00400 PH (STANDARD UNITS) 6.6 7.6 6.96 7 610 15669 4/24/1996 8/26/1999 3.048 00400 PH (STANDARD UNITS) 6.5 7.3 6.90 11 610 15669 1/26/1994 2/14/1996 6.06 00400 PH (STANDARD UNITS) 6.4 7 6.79 7 610 15669 8/22/1996 8/26/1999 6.096 00400 PH (STANDARD UNITS) 6.5 7.3 6.80 10 610 15669 4/24/1996 4/24/1996 7.62 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15669 8/22/1996 8/22/1996 7.9248 00400 PH (STANDARD UNITS) 7.2 7.2 7.20 1 610 15669 4/21/1999 4/21/1999 8.8392 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 610 15669 1/26/1994 2/14/1996 9.09 00400 PH (STANDARD UNITS) 6.4 7.1 6.79 7 610 15669 4/17/1997 8/26/1999 9.144 00400 PH (STANDARD UNITS) 6.4 6.8 6.63 6 610 15669 2/13/1997 9/3/1998 9.7536 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 2 610 15669 8/30/1995 8/30/1995 10.91 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15669 1/26/1994 8/25/1994 11.21 00400 PH (STANDARD UNITS) 6.8 6.9 6.85 2 610 15669 4/21/1994 4/21/1994 11.52 00400 PH (STANDARD UNITS) 7.5 7.5 7.50 1 610 15669 8/26/1999 8/26/1999 11.582 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15669 2/9/1995 2/9/1995 12.12 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15669 8/21/1997 4/29/1998 12.192 00400 PH (STANDARD UNITS) 6.5 6.7 6.57 3 610 15669 2/24/1999 2/24/1999 12.496 00400 PH (STANDARD UNITS) 6.4 6.4 6.40 1 610 15669 4/19/1995 4/19/1995 13.33 00400 PH (STANDARD UNITS) 6.4 6.4 6.40 1 610 15669 4/17/1997 4/17/1997 13.411 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15669 2/9/1995 2/9/1995 14.55 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15669 2/19/1998 2/19/1998 15.24 00400 PH (STANDARD UNITS) 6.4 6.4 6.40 1 610 15670 1/26/1994 2/14/1996 0.3 00400 PH (STANDARD UNITS) 7 8.2 7.41 7 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 15670 4/24/1996 8/26/1999 0.3048 00400 PH (STANDARD UNITS) 6.7 7.7 7.10 11 610 15670 1/26/1994 2/14/1996 3.03 00400 PH (STANDARD UNITS) 6.8 7.9 7.29 7 610 15670 4/24/1996 8/26/1999 3.048 00400 PH (STANDARD UNITS) 6.6 7.5 7.04 10 610 15670 1/26/1994 2/14/1996 6.06 00400 PH (STANDARD UNITS) 6.6 7.4 6.99 7 610 15670 4/24/1996 8/26/1999 6.096 00400 PH (STANDARD UNITS) 6.5 7.3 6.96 11 610 15670 1/26/1994 2/14/1996 9.09 00400 PH (STANDARD UNITS) 6.5 7.1 6.80 7 610 15670 4/24/1996 8/26/1999 9.144 00400 PH (STANDARD UNITS) 6.1 7.2 6.80 11 610 15670 1/26/1994 2/14/1996 12.12 00400 PH (STANDARD UNITS) 6.7 7.1 6.86 7 610 15670 4/24/1996 8/26/1999 12.192 00400 PH (STANDARD UNITS) 6.2 7.2 6.76 11 610 15670 4/21/1994 2/14/1996 15.15 00400 PH (STANDARD UNITS) 6.7 7.1 6.82 6 610 15670 2/13/1997 8/26/1999 15.24 00400 PH (STANDARD UNITS) 6.4 7.2 6.70 8 610 15670 8/22/1996 8/22/1996 16.154 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15670 9/2/1998 9/2/1998 16.459 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15670 4/24/1996 4/24/1996 16.764 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 1 610 15670 1/26/1994 1/26/1994 16.97 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 610 15670 4/21/1994 2/14/1996 18.18 00400 PH (STANDARD UNITS) 6.6 7.1 6.80 6 610 15670 4/17/1997 4/21/1999 18.288 00400 PH (STANDARD UNITS) 6.4 6.9 6.65 6 610 15670 2/13/1997 8/26/1999 18.897 00400 PH (STANDARD UNITS) 6.5 7.2 6.85 2 610 15670 8/21/1997 8/21/1997 20.421 00400 PH (STANDARD UNITS) 6.4 6.4 6.40 1 610 15670 4/21/1994 4/21/1994 20.61 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 15670 4/29/1998 4/29/1998 20.726 00400 PH (STANDARD UNITS) 6.4 6.4 6.40 1 610 15670 8/25/1994 8/25/1994 21.21 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 15670 2/19/1998 2/19/1998 21.64 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15670 2/24/1999 4/21/1999 21.945 00400 PH (STANDARD UNITS) 6.5 6.9 6.70 2 610 15670 4/17/1997 4/17/1997 22.555 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15670 2/9/1995 2/9/1995 23.03 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 610 15671 1/26/1994 2/14/1996 0.3 00400 PH (STANDARD UNITS) 6.9 8.1 7.37 7 610 15671 4/24/1996 8/26/1999 0.3048 00400 PH (STANDARD UNITS) 6.5 7.6 7.11 11 610 15671 1/26/1994 2/14/1996 3.03 00400 PH (STANDARD UNITS) 6.8 7.7 7.26 7 610 15671 4/24/1996 8/26/1999 3.048 00400 PH (STANDARD UNITS) 6.4 7.4 7.04 11 610 15671 1/26/1994 2/14/1996 6.06 00400 PH (STANDARD UNITS) 6.6 7.3 6.94 7 610 15671 4/24/1996 8/26/1999 6.096 00400 PH (STANDARD UNITS) 6.1 7.2 6.91 11 610 15671 1/26/1994 2/14/1996 9.09 00400 PH (STANDARD UNITS) 6.4 7.2 6.77 7 610 15671 4/24/1996 8/26/1999 9.144 00400 PH (STANDARD UNITS) 6.1 7.2 6.79 11 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 15671 1/26/1994 2/14/1996 12.12 00400 PH (STANDARD UNITS) 6.5 7.2 6.81 7 610 15671 4/24/1996 8/26/1999 12.192 00400 PH (STANDARD UNITS) 6.1 7.2 6.77 11 610 15671 1/26/1994 2/14/1996 15.15 00400 PH (STANDARD UNITS) 6.4 7.2 6.81 7 610 15671 4/24/1996 8/26/1999 15.24 00400 PH (STANDARD UNITS) 6 7.2 6.74 11 610 15671 8/22/1996 8/22/1996 17.678 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15671 1/26/1994 2/14/1996 18.18 00400 PH (STANDARD UNITS) 6.4 7.2 6.81 7 610 15671 2/13/1997 8/26/1999 18.288 00400 PH (STANDARD UNITS) 6 7.2 6.69 8 610 15671 2/19/1998 2/19/1998 19.202 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15671 2/14/1996 2/14/1996 19.7 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 610 15671 4/24/1996 4/24/1996 19.964 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 15671 9/2/1998 9/2/1998 20.726 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15671 8/30/1995 8/30/1995 20.91 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15671 4/21/1994 4/19/1995 21.21 00400 PH (STANDARD UNITS) 6.4 7.2 6.73 4 610 15671 2/13/1997 2/24/1999 21.336 00400 PH (STANDARD UNITS) 6.9 7.2 7.00 3 610 15671 4/29/1998 4/29/1998 21.945 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15671 8/26/1999 8/26/1999 22.25 00400 PH (STANDARD UNITS) 6.4 6.4 6.40 1 610 15671 1/26/1994 1/26/1994 22.42 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 610 15671 4/21/1994 8/25/1994 22.73 00400 PH (STANDARD UNITS) 6.4 6.6 6.50 2 610 15671 4/21/1999 4/21/1999 22.86 00400 PH (STANDARD UNITS) 6.4 6.4 6.40 1 610 15671 8/21/1997 8/21/1997 23.164 00400 PH (STANDARD UNITS) 6 6 6.00 1 610 15671 2/9/1995 4/19/1995 24.24 00400 PH (STANDARD UNITS) 6.8 7.2 7.00 2 610 15671 2/24/1999 2/24/1999 24.536 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15671 4/17/1997 4/17/1997 24.993 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15672 1/25/1994 2/14/1996 0.3 00400 PH (STANDARD UNITS) 6.9 8.2 7.33 7 610 15672 4/23/1996 4/17/1997 0.3048 00400 PH (STANDARD UNITS) 6.2 7.6 7.15 11 610 15672 1/25/1994 2/14/1996 3.03 00400 PH (STANDARD UNITS) 6.8 8.2 7.27 7 610 15672 4/23/1996 8/25/1999 3.048 00400 PH (STANDARD UNITS) 6.2 7.4 7.07 11 610 15672 1/25/1994 2/14/1996 6.06 00400 PH (STANDARD UNITS) 6.8 7.2 7.00 7 610 15672 4/23/1996 8/25/1999 6.096 00400 PH (STANDARD UNITS) 6.1 7.4 7.01 11 610 15672 1/25/1994 2/14/1996 9.09 00400 PH (STANDARD UNITS) 6.5 7.1 6.83 7 610 15672 4/23/1996 8/25/1999 9.144 00400 PH (STANDARD UNITS) 6.1 7.3 6.94 11 610 15672 1/25/1994 2/14/1996 12.12 00400 PH (STANDARD UNITS) 6.6 7.1 6.86 7 610 15672 4/23/1996 8/25/1999 12.192 00400 PH (STANDARD UNITS) 6.2 7.2 6.87 11 610 15672 1/25/1994 2/14/1996 15.15 00400 PH (STANDARD UNITS) 6.5 7.1 6.83 7 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 15672 4/23/1996 8/25/1999 15.24 00400 PH (STANDARD UNITS) 6.1 7.2 6.77 11 610 15672 1/25/1994 2/14/1996 18.18 00400 PH (STANDARD UNITS) 6.5 7.1 6.81 7 610 15672 4/23/1996 8/25/1999 18.288 00400 PH (STANDARD UNITS) 6.1 7.2 6.76 11 610 15672 8/24/1994 8/24/1994 19.7 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15672 8/21/1996 8/21/1996 20.116 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15672 1/25/1994 8/29/1995 21.21 00400 PH (STANDARD UNITS) 6.5 7.1 6.78 5 610 15672 2/13/1997 8/25/1999 21.336 00400 PH (STANDARD UNITS) 6.1 7.1 6.68 8 610 15672 4/23/1996 4/23/1996 21.945 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15672 2/14/1996 2/14/1996 22.12 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15672 9/2/1998 9/2/1998 22.555 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15672 2/8/1995 8/29/1995 24.24 00400 PH (STANDARD UNITS) 6.6 7.1 6.87 3 610 15672 2/13/1997 2/24/1999 24.384 00400 PH (STANDARD UNITS) 6.4 7 6.70 4 610 15672 4/20/1994 4/20/1994 24.85 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15672 8/21/1997 8/25/1999 24.993 00400 PH (STANDARD UNITS) 6.4 6.8 6.57 3 610 15672 1/25/1994 1/25/1994 25.45 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15672 4/17/1997 4/29/1998 25.908 00400 PH (STANDARD UNITS) 6.4 6.6 6.50 2 610 15672 4/18/1995 4/18/1995 26.67 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15672 2/8/1995 2/8/1995 27.42 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15672 2/24/1999 2/24/1999 28.194 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 15673 1/25/1994 2/13/1996 0.3 00400 PH (STANDARD UNITS) 6.9 8.1 7.33 7 610 15673 4/23/1996 8/25/1999 0.3048 00400 PH (STANDARD UNITS) 6.7 8.1 7.18 10 610 15673 1/25/1994 2/13/1996 3.03 00400 PH (STANDARD UNITS) 6.7 7.4 7.10 7 610 15673 4/23/1996 8/25/1999 3.048 00400 PH (STANDARD UNITS) 6.5 7.8 7.09 10 610 15673 1/25/1994 2/13/1996 6.06 00400 PH (STANDARD UNITS) 6.6 7.1 6.93 7 610 15673 4/23/1996 8/25/1999 6.096 00400 PH (STANDARD UNITS) 6.4 7.4 6.94 10 610 15673 1/25/1994 2/13/1996 9.09 00400 PH (STANDARD UNITS) 6.4 7 6.80 7 610 15673 4/23/1996 8/25/1999 9.144 00400 PH (STANDARD UNITS) 6.4 7.2 6.86 10 610 15673 1/25/1994 2/13/1996 12.12 00400 PH (STANDARD UNITS) 6.6 7 6.83 7 610 15673 8/21/1996 8/25/1999 12.192 00400 PH (STANDARD UNITS) 6.4 7 6.76 8 610 15673 4/23/1996 9/2/1998 13.716 00400 PH (STANDARD UNITS) 6.9 7.1 7.00 3 610 15673 2/13/1996 2/13/1996 14.24 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15673 1/25/1994 4/18/1995 15.15 00400 PH (STANDARD UNITS) 6.6 7 6.87 3 610 15673 4/18/1997 2/23/1999 15.24 00400 PH (STANDARD UNITS) 6.3 7 6.68 4 610 15673 8/29/1995 8/29/1995 15.76 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 15673 4/29/1998 8/25/1999 15.849 00400 PH (STANDARD UNITS) 6.5 6.6 6.55 2 610 15673 4/20/1994 8/24/1994 16.06 00400 PH (STANDARD UNITS) 6.7 6.9 6.80 2 610 15673 4/18/1997 4/18/1997 17.678 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15673 4/18/1995 4/18/1995 18.18 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 1 610 15673 2/19/1998 2/23/1999 19.202 00400 PH (STANDARD UNITS) 6.8 6.9 6.85 2 610 15673 2/8/1995 2/8/1995 19.7 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15674 1/25/1994 2/13/1996 0.3 00400 PH (STANDARD UNITS) 6.5 8 7.24 7 610 15674 8/25/1999 4/20/1999 0.3048 00400 PH (STANDARD UNITS) 6.7 7.6 7.15 11 610 15674 1/25/1994 2/13/1996 3.03 00400 PH (STANDARD UNITS) 6.4 7.4 7.00 7 610 15674 4/23/1996 8/25/1999 3.048 00400 PH (STANDARD UNITS) 6.4 7.3 6.98 11 610 15674 4/23/1996 4/23/1996 4.572 00400 PH (STANDARD UNITS) 7.2 7.2 7.20 1 610 15674 9/2/1998 9/2/1998 5.1816 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15674 8/21/1996 9/2/1998 5.4864 00400 PH (STANDARD UNITS) 6.6 6.8 6.70 2 610 15674 1/25/1994 2/13/1996 6.06 00400 PH (STANDARD UNITS) 6.8 7.1 6.88 6 610 15674 2/13/1997 8/25/1999 6.096 00400 PH (STANDARD UNITS) 6.6 7.1 6.89 8 610 15674 4/20/1994 8/29/1995 7.58 00400 PH (STANDARD UNITS) 6.3 6.7 6.50 2 610 15674 4/29/1998 4/29/1998 8.2296 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15674 4/18/1995 4/18/1995 8.48 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 1 610 15674 2/13/1996 2/13/1996 8.79 00400 PH (STANDARD UNITS) 7 7 7.00 1 610 15674 1/25/1994 8/24/1994 9.09 00400 PH (STANDARD UNITS) 6.9 7.1 7.00 2 610 15674 2/13/1997 2/19/1998 9.144 00400 PH (STANDARD UNITS) 6.7 6.8 6.77 3 610 15674 8/25/1999 8/25/1999 9.2964 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15674 4/20/1999 4/20/1999 9.4488 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 610 15674 2/23/1999 2/23/1999 10.058 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15674 4/18/1997 4/18/1997 10.363 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15674 2/8/1995 2/8/1995 10.61 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15674 2/13/1997 2/13/1997 11.277 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15675 1/25/1994 2/13/1996 0.3 00400 PH (STANDARD UNITS) 6.8 8.3 7.31 7 610 15675 4/23/1996 8/25/1999 0.3048 00400 PH (STANDARD UNITS) 6.7 8.2 7.23 11 610 15675 1/25/1994 2/13/1996 3.03 00400 PH (STANDARD UNITS) 6.5 7.8 7.11 7 610 15675 4/23/1996 8/25/1999 3.048 00400 PH (STANDARD UNITS) 6.4 7.9 7.11 11 610 15675 1/25/1994 2/13/1996 6.06 00400 PH (STANDARD UNITS) 6.5 7 6.87 7 610 15675 4/23/1996 8/25/1999 6.096 00400 PH (STANDARD UNITS) 6.2 7.3 6.85 11 610 15675 2/13/1996 2/13/1996 7.58 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 15675 4/23/1996 4/23/1996 8.382 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15675 8/24/1994 8/24/1994 8.79 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15675 4/20/1994 8/29/1995 9.09 00400 PH (STANDARD UNITS) 6.5 6.8 6.67 3 610 15675 8/21/1996 8/25/1999 9.144 00400 PH (STANDARD UNITS) 6.3 6.9 6.66 8 610 15675 1/25/1994 1/25/1994 9.39 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 610 15675 2/8/1995 2/8/1995 10.3 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15675 4/29/1998 4/29/1998 10.363 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15675 4/18/1995 4/18/1995 10.91 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15675 4/20/1994 4/20/1994 11.21 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15675 8/29/1995 8/29/1995 11.82 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 15675 9/2/1998 9/2/1998 11.887 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 610 15675 4/18/1997 4/20/1999 12.192 00400 PH (STANDARD UNITS) 6.8 6.9 6.83 3 610 15675 8/25/1999 8/25/1999 12.801 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 610 15675 8/21/1997 2/19/1998 13.411 00400 PH (STANDARD UNITS) 6.3 6.7 6.50 2 610 15675 4/18/1997 4/18/1997 14.63 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 610 15675 4/20/1999 4/20/1999 15.24 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 610 15675 2/23/1999 2/23/1999 15.544 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 610 16784 6/1/1998 7/6/1999 0.3 00400 PH (STANDARD UNITS) 7.1 8.5 7.64 14 610 16785 6/1/1998 7/6/1999 0.3 00400 PH (STANDARD UNITS) 6.7 7.9 7.21 19 610 16786 6/1/1998 7/6/1999 0.3 00400 PH (STANDARD UNITS) 6.1 8 7.35 19 610 16787 6/1/1998 7/6/1999 0.3 00400 PH (STANDARD UNITS) 7 8.2 7.52 19 610 16788 5/6/1999 8/13/1999 0.3 00400 PH (STANDARD UNITS) 6.9 8.6 7.39 9 1 610 16789 5/6/1999 8/13/1999 0.3 00400 PH (STANDARD UNITS) 6.7 7.5 7.12 9 610 16790 5/6/1999 8/13/1999 0.3 00400 PH (STANDARD UNITS) 7.3 7.9 7.54 9 610 16791 6/1/1998 7/6/1999 0.3 00400 PH (STANDARD UNITS) 6.9 8.7 7.73 18 1 610 16792 5/6/1999 8/13/1999 0.3 00400 PH (STANDARD UNITS) 7.2 7.9 7.53 9 610 16793 5/6/1999 8/13/1999 0.3 00400 PH (STANDARD UNITS) 7.2 8.7 7.96 10 1 615 10502 6/25/1991 11/12/2002 0.3 00400 PH (STANDARD UNITS) 6.2 8.6 7.39 33 1 615 10502 11/2/1995 10/30/2001 0.5 00400 PH (STANDARD UNITS) 7.3 7.8 7.55 6 615 10502 6/8/1994 6/8/1994 0.7 00400 PH (STANDARD UNITS) 7.4 7.4 7.40 1 615 10502 11/29/1994 11/12/2002 1 00400 PH (STANDARD UNITS) 6.1 8.4 7.33 17 1 615 10502 6/25/1991 6/25/1991 1.01 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 615 10502 2/6/1997 2/6/1997 1.3 00400 PH (STANDARD UNITS) 7.4 7.4 7.40 1 615 10502 1/20/1999 5/22/2001 1.5 00400 PH (STANDARD UNITS) 7.6 7.7 7.65 2 Table 4A-38. Summary of pH Data for Segments 0610 and 0615 Period N < or > Segment ID Station ID Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 615 10502 2/22/1995 2/7/2002 2 00400 PH (STANDARD UNITS) 6.1 7.3 6.58 4 2 615 10502 2/7/2002 2/7/2002 2.5 00400 PH (STANDARD UNITS) 7.3 7.3 7.30 1 615 10621 8/21/1990 11/12/2002 0.3 00400 PH (STANDARD UNITS) 6 8.2 7.09 51 3 615 10621 8/8/1996 8/8/1996 0.7 00400 PH (STANDARD UNITS) 7.4 7.4 7.40 1 615 10621 2/27/1992 11/12/2002 1 00400 PH (STANDARD UNITS) 6.4 8.1 7.05 35 1 615 10621 8/21/1990 6/25/1991 1.01 00400 PH (STANDARD UNITS) 6.7 7.1 6.90 3 615 10621 11/2/1995 7/9/2002 1.5 00400 PH (STANDARD UNITS) 6.7 7.5 7.05 4 615 10621 7/15/1992 8/5/1993 1.52 00400 PH (STANDARD UNITS) 7.2 7.5 7.35 2 615 10621 2/27/1992 11/12/2002 2 00400 PH (STANDARD UNITS) 6.4 8 6.99 28 1 615 10621 2/22/1991 6/25/1991 2.01 00400 PH (STANDARD UNITS) 6.7 6.8 6.75 2 615 10621 6/8/1994 11/12/2002 2.5 00400 PH (STANDARD UNITS) 6.6 7.1 6.89 9 615 10621 2/22/1991 6/25/1991 2.99 00400 PH (STANDARD UNITS) 6.6 6.8 6.70 2 615 10621 2/27/1992 2/7/2002 3 00400 PH (STANDARD UNITS) 6.4 7.1 6.69 8 2 615 10621 2/7/2002 2/7/2002 3.5 00400 PH (STANDARD UNITS) 7 7 7.00 1 615 10621 2/22/1995 3/13/2001 4 00400 PH (STANDARD UNITS) 6.4 6.6 6.48 4 2 615 10621 2/17/1998 2/17/1998 4.5 00400 PH (STANDARD UNITS) 6.6 6.6 6.60 1 615 10623 6/25/1991 11/12/2002 0.3 00400 PH (STANDARD UNITS) 5.6 7.9 6.92 49 3 615 10623 10/27/1993 11/12/2002 1 00400 PH (STANDARD UNITS) 5.7 7.5 6.77 36 5 615 10623 6/25/1991 6/25/1991 1.01 00400 PH (STANDARD UNITS) 7 7 7.00 1 615 10623 8/17/1994 8/17/1994 1.5 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 615 10623 7/15/1992 8/5/1993 1.52 00400 PH (STANDARD UNITS) 6.8 7.7 7.25 2 615 10623 10/27/1993 11/12/2002 2 00400 PH (STANDARD UNITS) 5.8 7.4 6.73 34 6 615 10623 6/25/1991 6/25/1991 2.01 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 615 10623 1/25/1994 7/9/2002 2.5 00400 PH (STANDARD UNITS) 6.5 7.4 6.81 9 615 10623 10/27/1993 10/27/1993 2.8 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 615 10623 6/25/1991 6/25/1991 2.99 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 615 10623 6/8/1994 11/12/2002 3 00400 PH (STANDARD UNITS) 6.2 6.9 6.55 15 4 615 10623 8/5/1993 8/5/1993 3.05 00400 PH (STANDARD UNITS) 7.5 7.5 7.50 1 615 10623 1/20/1999 11/12/2002 3.5 00400 PH (STANDARD UNITS) 6.2 6.7 6.45 2 1 615 10623 2/22/1995 2/7/2002 4 00400 PH (STANDARD UNITS) 6.3 6.7 6.48 4 2 Table 4A-39. Summary of Conductivity Data for Segments 0610 and 0615 N > Segment ID Station ID Period Begin Period End Depth Storet ID Parameter Min Max Avg N Criteria 610 10612 2/26/1991 8/14/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 91 191 134.52 52 NA 610 10613 8/20/1990 12/10/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 88 838 247.07 41 NA 610 10613 8/16/1994 8/16/1994 0.30488 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 314 314 314.00 1 NA 610 10614 10/28/1996 12/10/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 86 185 112.05 22 NA 610 14906 12/10/1996 8/22/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 101 184 133.11 38 NA 610 14907 8/21/1996 12/10/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 85 185 139.04 25 NA 610 15357 11/7/1996 8/19/1997 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 143 229 177.57 7 NA 610 15358 11/7/1996 8/19/1997 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 95 197 132.57 7 NA 610 15359 11/7/1996 8/19/1997 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 121 273 186.43 7 NA 610 15360 11/7/1996 8/19/1997 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 92 149 115.29 7 NA 610 15361 11/7/1996 8/7/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 87 175 133.29 28 NA 610 15362 11/12/1996 8/21/1997 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 80 176 143.43 7 NA 610 15363 11/12/1996 8/21/1997 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 168 235 188.00 7 NA 610 15364 11/12/1996 8/9/1996 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 45 149 101.67 9 NA 610 15365 11/12/1996 8/21/1997 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 45 83 63.67 6 NA 610 15366 11/12/1996 8/21/1997 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 121 165 134.43 7 NA 610 15522 3/13/2001 8/22/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 100 145 120.93 15 NA 610 15523 3/8/2001 8/14/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 94 121 110.47 15 NA 610 15524 3/8/2001 8/14/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 90 177 127.60 15 NA 610 15526 3/13/2001 8/22/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 98 145 122.33 15 NA 610 15527 3/13/2001 8/22/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 96 149 121.93 15 NA 610 16784 6/1/1998 7/6/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 77 131 98.78 9 NA 610 16785 6/1/1998 7/6/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 84 127 104.70 10 NA 610 16786 6/1/1998 7/6/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 68 131 102.00 10 NA 610 16787 6/1/1998 7/6/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 68 130 95.22 9 NA 610 16788 5/6/1999 8/13/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 142 205 174.22 9 NA 610 16789 5/6/1999 8/13/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 175 310 233.67 9 NA 610 16790 5/6/1999 8/13/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 75 133 104.11 9 NA 610 16791 6/1/1998 7/6/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 88 147 110.30 10 NA 610 16792 5/6/1999 8/13/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 105 150 129.56 9 NA 610 16793 5/6/1999 8/13/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 103 148 127.90 10 NA 615 10502 6/25/1991 11/12/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 96 3381 1872.79 33 NA 615 10621 8/21/1990 11/12/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 82 1844 599.20 51 NA 615 10623 6/25/1991 11/12/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 96 408 168.49 49 NA Historical Data Review for Sam Rayburn Reservoir

Appendix 4B Dissolved Oxygen Depth Profiles for Segments 0610 and 0615 (TRACS Data)

June 2003 4B-1 Historical Data Review for Sam Rayburn Reservoir

Dissolved oxygen at depth was assessed using a graphical approach to illustrate dissolved oxygen dynamics at several locations within the reservoir across depths and seasonal changes. Figure 4B- 1 presents the locations of the locations where DO profiles were analyzed. These data were grouped into two primary seasonal categories, late spring, summer and fall, and winter and early spring. These groupings facilitate evaluation of what depth level the reservoir stratifies based on the time of year and the location within the reservoir. Figures 4B-2 through 4B-11 present the dissolved oxygen graphs. Note that the red line indicating the 3.0 mg/L minimum criterion only applies to the mixed layer, not the entire water column.

Figure 4B-2 illustrates dissolved oxygen stratification at site 14906 located near the Dam. This profile represents one of the deeper sections of the reservoir and illustrates the annual variability as well as seasonal variability in dissolved oxygen at depth. Temperature in the reservoir during the seasonal and monthly periods are likely a large factor in the observed profiles. The criterion applied to the reservoir to assess the potential for exceedances are within the estimated mixed surface layer, defined as the depth below surface where the temperature decreases by 0.5°C or more. The ranges of temperatures at site 14906 indicate that the mixed surface layer falls between <3 feet to 15 feet depending upon the time of year. Based on this estimated layer and a minimum dissolved oxygen criterion of 3.0 mg/L, no instantaneous dissolved oxygen concentrations at site 14906 exceed the criterion from 1996 to 2000. Despite this, there is a sharp decline in dissolved oxygen concentrations between about 15 and 30 feet below the surface and it is clear that during the hottest months (i.e., July, August, and September) thermal stratification as well as other factors result in a hypolimnetic dissolved oxygen deficit.

Figure 4B-3 shows dissolved oxygen concentrations at station 14906 during winter and early spring months. Turn over of the stratified layers has apparently occurred during the periods when most of these sample data were collected. 2000 data indicates preliminary stratification is beginning in March. For the most part, these data indicate that the reservoir is well mixed at this station during the winter and spring.

Due to potential spawning periods and presence of early life stages for aquatic organisms, particularly fish, dissolved oxygen criteria are higher during spring periods (defined as those periods when water temperatures are between 17.2 and 22.7°C). The minimum instantaneous dissolved oxygen for this period is 4.5 mg/L . No dissolved oxygen criterion exceedances occurred in the mixed surface layer for site 14906.

Figure 4B-4 and 4B-5 illustrate dissolved oxygen concentrations at depth for about six time periods, spanning from 1994 to 1999 at station 15675 located on the Ayish Bayou arm of the reservoir. Water temperature data corresponding to this site and the periods for which dissolved oxygen are illustrated were collected at large depth intervals. The mixed surface layer occurs somewhere between 1 and 9 feet below the surface. In this shallow arm of the reservoir as compared to the previous site, stratification appears to relatively consistently occur at or near about 10 feet below the water surface. No DO concentrations in the mixed surface layer during either the summer or winter profiles exceed criterion.

June 2003 4B-2 Historical Data Review for Sam Rayburn Reservoir

10613

15667 #

# 10612 15675

# #

14906

# Stations Used for DO Profile Graphs County Boundary River or Stream Basin Reservoir

Figure 4B-1. Location of monitoring stations where DO depth profiles were analyzed

June 2003 4B-3 Historical Data Review for Sam Rayburn Reservoir

Figures 4B-6 and 4B-7 illustrate dissolved oxygen profiles at station 10612 located in the central portion of the Reservoir near the Hwy 147 crossing of the reservoir. This monitoring station, of the five evaluated, has the largest amount of dissolved oxygen data collected at depth. Data are available from 1991 to 2002. Reservoir depth at this station appears to be about 60 feet. Of the 15 profiles illustrated in Figure 4-6 during the summer months, all show a relatively consistent trend for surficial dissolved oxygen concentrations that range from about 6.5 to about 9.0 mg/L. Over the time span represented, the mixed surface layer, by definition, ranged from <3 feet to approximately 33 feet. Time periods included May through September, which may account for the widely varying temperatures in the upper 30 feet. Dissolved oxygen concentrations for all profiles did not exceed the minimum criterion for the respective mixed surface layers associated with the year and month in which the data were collected. Similar to station 14906, hypolimnetic oxygen deficits begin to appear depending upon the time period sampled below about 25 feet where the dissolved oxygen drops to from 1.0 to 0.0 mg/L.

Figure 4B-7 illustrates the winter and early spring dissolved oxygen profiles for station 10612, ranging over the same time period. The reservoir at this site during these cooler months is well mixed with dissolved oxygen ranging from about 7.5 to 11.5 mg/L near the surface. During most months, these concentrations are relatively static from surface to bottom.

Figures 4B-8 and 4B-9 show dissolved oxygen profiles at station 15667 in the Attoyac Bayou arm of the reservoir which is approximately 60 feet in depth. This much smaller data set ranges from 1994 to 1999 with a single profile each year. During the summer months, surficial dissolved oxygen ranged from 4.9 to 7.2 mg/L, although most of the surficial dissolved oxygen data were 6.5 mg/L or greater. Similar to measurement data for Ayish Bayou, temperature at depth was collected at a large depth interval, thus one can only estimate that the mixed surface layer lies between 1 and about 9 feet. It appears, however, that within the upper ten feet, dissolved oxygen concentrations are relatively similar to their respective surface concentrations. Unlike other sites, dissolved oxygen below about 20 feet ranged from < 1 mg/L to >6 mg/L. A local weather event in August of 1994 resulted in a profile that was more reminiscent of a winter profile rather than a summer profile.

Similar to other winter profiles discussed, station 15667 exhibits similarly mixed conditions during the winter months (Figure 4B-9). Surficial dissolved oxygen concentrations ranged from about 7 to 11 mg/L. Data from spring profiles indicate the beginning of stratification at this site as dissolved oxygen declined from the surface at about 7.0 mg/L to 4.0 or less near the bottom of the reservoir.

Figures 4B-10 and 4B-11 illustrate dissolved oxygen profiles for station 10613 near Hwy 103 in the upper Angelina Arm of the Reservoir. This station is very near the separation point between segments 0610 and 0615. Data for these profiles ranged in time from 1990 to 2002. Of the sites evaluated for vertical dissolved oxygen trends, this is the shallowest site with water depths of about 33 to 35 feet. Unlike other sites assessed, dissolved oxygen concentrations at the surface for this site are highly variable, ranging from 3.7 to 8.5 mg/L. The mixed surface layer at this site is shallower when compared to other sites, typically ranging from about 6 feet or less. On a few occasions, the mixed surface layer increased to about 9 to 18 feet. Even with the low concentration of 3.7 mg/L recorded in 1998, no dissolved oxygen concentration exceeded the minimum criterion within the mixed surface layer. However, during this period in August of

June 2003 4B-4 Historical Data Review for Sam Rayburn Reservoir

1998, dissolved oxygen concentrations were critically low, ranging at the surface from 3.7 to 2.8 mg/L just 9 feet below the surface. Similar to the surficial data, dissolved oxygen at depth was also highly variable, ranging from < 1 mg/L to >5 mg/L depending upon the time of year. Observations of higher variability in dissolved oxygen across all strata at this site may be due to among other factors, riverine influences, point source discharges, and/or shallower depth.

Mixing due to discharges from tributaries or prevailing winds may cause a mixing effect due to shallower depths that cause this section of the reservoir not to stratify as intensely as the deeper water sections. Discharges from point sources may affect nutrients, which in turn affect macrophytic and algal production. Numerous factors may account for why this station appears to be so different from the other stations during the summer months. Figure 4B-11 shows station 10613 during winter months, which illustrates strong similarities to other sites, with well mixed profiles, and higher levels of dissolved oxygen. Surficial dissolved oxygen concentrations ranged from about 6 mg/L to 11 mg/L, with no exceedances of the criterion observed during the winter months.

June 2003 4B-5 Historical Data Review for Sam Rayburn Reservoir

DO (mg/l) 0 1 2 3 4 5 6 7 8 9 10 0

40 19960821 19980804 50 19990817 Depth (feet)

60 19990927 20000713 70 20010619

80 19980518 19990622 90

Figure 4B-2. Late spring, summer, and fall DO at site 14906 in Sam Rayburn Reservoir

DO (mg/l) 0 1 2 3 4 5 6 7 8 9 10 0

20 19971124 30 19980218 19981123 40 19991216 50 20000308 Depth (feet) 20001010 60 20010109 70 20010402 20020108 80 20020314 90 20021211 Figure 4B-3. Winter and early fall DO at site 14906 in Sam Rayburn Reservoir

June 2003 4B-6 Historical Data Review for Sam Rayburn Reservoir

DO (mg/l) 0 1 2 3 4 5 6 7 8 9 10 0

19940824 20 19950829

30 19960821

19970821 Depth (feet) 40 19980902

19990825 50

Figure 4B-4. Late spring, summer, and fall DO at site 15675 in Sam Rayburn Reservoir

19940125 DO (mg/l)

0 1 199404202 3 4 5 6 7 8 9 10 11 0 19950208

19950418

10 19960213

19960423

20 19970213

19970418

30 19980219

19980429 Depth (feet) 40 19990223

19990420 50

Figure 4B-5. Winter and early spring DO at site 15675 in Sam Rayburn Reservoir

June 2003 4B-7 Historical Data Review for Sam Rayburn Reservoir

DO (mg/l) 0 1 2 3 4 5 6 7 8 9 10 0

19910624 19920716 40 19930804 19940818 50

Depth (feet) 19950516 19960808

60 19970710 19980804

19990622 19990817 70 19990927 20000612 80 20010619 20020618

90 20020918

Figure 4B-6. Late spring, summer, and fall DO at site 10612 in Sam Rayburn Reservoir

DO (mg/l) 0 1 2 3 4 5 6 7 8 9 10 11 12 0

10 19910226 19920227 20 19930218 19940126 19950223 19951101 30 19970303 19970414 19971124 19980218 40 19980422 19981123 19990218 19991216 50

Depth (feet) 20000308 20001010 20010109 20010402 60 20011017 20020108

70 20020314 20021211

90 Figure 4B-7. Winter and spring DO at site 10612 in Sam Rayburn Reservoir

June 2003 4B-8 Historical Data Review for Sam Rayburn Reservoir

DO (mg/l) 0 1 2 3 4 5 6 7 8 9 10 0

30 19940825

19950830 40 Depth (feet)

19960822

50 19970821

19980903 60 19990826

Figure 4B-8. Late spring, summer, and fall DO at site 15667 in Sam Rayburn Reservoir

DO (mg/l) 0 1 2 3 4 5 6 7 8 9 10 11 0 19940126

19940421

10 19950209

19950419

20 19960214 19960424

30 19970213 19970417

19980219 40 Depth (feet) 19980429

19990224 50

Figure 4B-9. Winter and early spring DO at site 15667 in Sam Rayburn Reservoir

June 2003 4B-9 Historical Data Review for Sam Rayburn Reservoir

DO (mg/l) 0 1 2 3 4 5 6 7 8 9 10 0

19900820 19910730 20 19920715 19920902 19930804

Depth (feet) 19930819 19940816 25 19950516 19950808 19960808 19970710 19980804 30 19990622 19990817 19990928 20000613 35 20010618 20020617 20020918

Figure 4B-10. Late spring, summer, and fall DO at site 10613 in Sam Rayburn Reservoir

DO (mg/l) 0 1 2 3 4 5 6 7 8 9 10 11 0 19910226 19920227 19930218 19940126 19950222 19951101 5 19960129 19970303 19970409 19971124 19980218 19980422 10 19981123 19990218 19991215 20000307 20001009 20010108 15 20010326 20011017 20020107 20020313 20021210 20 Depth (feet) 25

Figure 4B-11. Winter and early spring DO at site 10613 in Sam Rayburn Reservoir

June 2003 4B-10 Historical Data Review for Sam Rayburn Reservoir

Appendix 4C Summary of STORET Water Quality Monitoring Data for Sam Rayburn Reservoir

June 2003 4C-1 Historical Data Review for Sam Rayburn Reservoir

Table 4C-1. Summary of Dissolved Oxygen Data for Segment 0610 Station ID Start Date End Date Dissolved Oxygen (mg/L) Number of Minimum Maximum Average Number of Observations Exceedancesa 14907 8/21/96 8/21/96 2 1.0 2.5 1.8 0 14906 8/21/96 12/10/98 13 1.0 7.5 3.6 1 310437094065501 1/25/94 2/13/97 81 0.5 12.6 8.6 0 310802094112201 1/26/94 2/13/97 75 0.5 11.0 7.8 0 310816094041401 1/25/94 2/13/97 56 0.5 11.6 8.1 0 311000094010301 1/25/94 2/13/97 36 2.8 11.9 8.3 0 311039094141201 1/26/94 2/13/97 64 0.6 11.0 7.8 0 311137094051401 1/25/94 2/13/97 39 2.3 11.7 8.3 0 311804094234901 1/26/94 2/13/97 43 3.1 10.3 7.4 0 311817094190701 1/26/94 2/13/97 38 3.0 10.8 7.6 0 311828094191801 1/26/94 2/13/97 63 0.5 11.2 7.3 0 312216094280601 1/26/94 2/14/97 30 4.1 10.3 7.4 0 06100100 2/26/91 7/16/92 65 0.0 9.4 6.0 0 06100200 8/20/90 7/15/92 40 0.8 7.6 5.5 0 aObservations compared to the water quality criterion of 3.0 mg/L for segment 0610 (Source: Texas Administrative Code 307.10(1))

Table 4C-2. Summary of Surface Chlorophyll a Data for Segment 0610 Station ID Start Date End Date Chlorophyll a ( µg/L) Number of Exceedancesa Number of Minimum Maximum Average Reference Screening Observations Conditions Level 14907 8/21/96 8/21/96 1 29.3 29.3 29.3 1 1 14906 8/21/96 8/21/96 1 4.0 4.0 4.0 1 0 06100100 6/24/91 7/16/92 3 2.3 11.3 6.8 2 0 06100200 8/20/90 7/15/92 4 1.0 20.8 12.8 3 0 aCompared to 21.4µg/L screening level (Source: TNRCC 2002) and 2.834 µg/L reference condition (Source: USEPA 2000).

Table 4C-3. Summary of Secchi Depth Data for Segment 0610 Station ID Start Date End Date Secchi Depth (m) Number of Minimum Maximum Average Number of Observations Exceedancesa 14907 8/21/96 8/21/96 1 0.33 0.33 0.33 1 310437094065501 1/25/1994 2/13/1997 10 1.30 2.70 2.01 0 310802094112201 8/25/1994 2/13/1997 6 1.20 2.70 1.83 0 310816094041401 1/25/1994 2/13/1997 8 1.40 2.70 1.89 0 311000094010301 1/25/1994 2/13/1997 9 0.90 2.40 1.69 1 311039094141201 8/25/1994 2/13/1997 7 1.50 2.48 1.97 0 311137094051401 1/25/1994 2/13/1997 10 1.00 2.35 1.66 1 311804094234901 8/25/1994 2/13/1997 7 0.50 1.20 0.88 5 311817094190701 1/26/1994 2/13/1997 10 0.55 1.45 0.96 8 311828094191801 1/26/1994 2/13/1997 10 0.70 1.90 1.43 2 312216094280601 1/26/1994 2/14/1997 9 0.20 1.80 0.77 8 06100100 2/26/1991 7/16/1992 4 0.63 1.80 1.04 3 06100200 2/26/1991 7/15/1992 4 0.35 0.89 0.66 4 a Compared to EPA’s Reference Condition of 1.1 meters (Source: EPA, 2000)

June 2003 4C-2 Historical Data Review for Sam Rayburn Reservoir

Table 4C-4. Summary of Surface Total Phosphorus Data for Segment 0610 Station ID Start Date End Date Total Phosphorus (mg/L) Number of Exceedancesa Number of Minimum Maximum Average Reference Screening Observations Conditions Level 14907 8/21/96 8/21/96 1 0.08 0.08 0.08 1 0 14906 8/21/96 8/21/96 1 0.01 0.01 0.01 0 0 06100100 2/26/91 7/16/92 4 0.04 0.18 0.10 4 0 06100200 8/20/90 7/15/92 5 0.06 0.11 0.08 5 0 aCompared to 0.18-mg/L screening level (Source: TNRCC 2002) and 0.0325-mg/L reference condition (Source: USEPA 2000).

Table 4C-5. Summary of Surface Total Orthophosphorus Data for Segment 0610 Station ID Start Date End Date Total Orthophosphorus (mg/L) Number of Minimum Maximum Average Number of Observations Exceedancesa 14907 8/21/96 8/21/96 1 0.10 0.10 0.10 1 14906 12/10/96 12/10/96 1 0.10 0.10 0.10 1 aCompared to 0.05-mg/L screening level (Source: TNRCC 2002).

Table 4C-6. Summary of Surface Total Nitrogen Data for Segment 0610 Station ID Start Date End Date Total Nitrogen (mg/L) Number of Minimum Maximum Average Number of Observations Exceedancesa 06100100 2/26/91 6/24/91 2 0.47 0.58 0.53 1 06100200 8/20/90 2/26/91 2 0.79 0.82 0.81 2 aCompared to 0.492-mg/L reference condition (Source: USEPA 2000).

Table 4C-7. Summary of Surface NO2+NO3 Data for Segment 0610 Station ID Start Date End Date NO2+NO3 (mg/L) Number of Exceedancesa Number of Minimum Maximum Average Reference Screening Observations Conditions Level 06100100 2/26/91 7/16/92 3 0.02 0.13 0.07 2 0 06100200 8/20/90 7/15/92 5 0.02 0.14 0.06 2 0 aCompared to 0.32-mg/L screening level (Source: TNRCC 2002) and 0.033-mg/L reference conditions (Source: USEPA 2000).

Table 4C-8. Summary of Surface TKN Data for Segment 0610 Station ID Start End Date TKN (mg/L) Date Number of Minimum Maximum Average Number of Observations Exceedancesa 14907 8/21/96 8/21/96 1 0.71 0.71 0.71 1 14906 8/21/96 8/21/96 1 0.47 0.47 0.47 1 06100100 2/26/91 6/24/91 2 0.45 0.45 0.45 0 06100200 8/20/90 2/26/91 2 0.62 0.80 0.73 2 aCompared to 0.459-mg/L screening level (Source: USEPA 2000).

June 2003 4C-3 Historical Data Review for Sam Rayburn Reservoir

Table 4C-9. Summary of Ammonia Data for Segment 0610 Unionized Ammonia (mg/L) Station ID Start Date End Date Number of Number of Minimum Maximum Average Observations Exceedancesa 14907 8/21/96 8/21/96 1 0.01 0.01 0.01 0 14906 8/21/96 8/21/96 1 0.01 0.01 0.01 0 06100100 2/26/91 7/16/92 6 0.01 0.55 0.19 0 06100200 8/20/90 7/15/92 9 0.02 0.56 0.18 0 aCompared to 0.106 mg/L screening level (Source: TNRCC, 2002).

Table 4C-10. Summary of Total Organic Carbon Data for Segment 0610 TOC (mg/L) Station ID Start Date End Date Number of Minimum Maximum Average Observations 14907 8/21/96 8/21/96 1 8.0 8.0 8.0 14906 8/21/96 8/21/96 1 6.0 6.0 6.0 06100100 2/26/91 7/16/92 6 5.0 11.0 8.0 06100200 8/20/90 7/15/92 9 6.0 12.0 9.8

Table 4C-11. Summary of Metals Data for Segment 0610 Metals (µg/L) Station ID Start End Date Number of Minimum Maximum Average Number of Date Observations Exceedancesa Dissolved 06100200 7/30/91 7/30/91 1 10 10 10 0 arsenic (As) Dissolved 06100200 7/30/91 7/30/91 1 4 4 4 0 copper (Cu) Dissolved lead 06100200 7/30/91 7/30/91 1 3 3 3 0 (Pb) Total selenium 06100200 8/20/90 8/20/90 1 2 2 2 0 (Se) Dissolved zinc 06100200 7/30/91 7/30/91 1 40 40 40 0 (Zn) aObservations compared to applicable water quality criterion for metals for segment 0610 (Source: Texas Administrative Code 307.6(c) and 307.6(c)(8)).

Table 4C-12. Summary of Fecal Coliform Bacteria Data for Segment 0610 Station ID Start Date End Date Fecal Coliform Bacteria (counts/100 mL) Number of Minimum Maximum Average Number of Observations Exceedancesa 14907 8/21/96 8/21/96 1 9 9.0 9.0 0 14906 12/10/96 12/10/96 1 3 3.0 3.0 0 310437094065501 1/25/94 2/13/97 10 0 10.0 2.0 0 311828094191801 1/26/94 2/13/97 10 0 220.0 23.0 0 312216094280601 1/26/94 2/14/97 9 1 200.0 36.3 0 06100100 2/26/91 2/27/92 3 1 6.0 3.3 0 06100200 8/20/90 2/27/92 3 3 113.0 72.0 0 aObservations compared to the water quality criterion of 200 counts/100mL for segment 0610 (Source: Texas Administrative Code 307.10(1)).

June 2003 4C-4 Historical Data Review for Sam Rayburn Reservoir

Table 4C-13. Summary of Total Alkalinity Data for Segment 0610 Station ID Start Date End Date Total Alkalinity as CACO3 (mg/L) Number of Minimum Maximum Average Observations 14907 8/21/96 8/21/96 1 34 34 34 14906 8/21/96 8/21/96 1 19 19 19 310437094065501 1/25/94 8/29/95 12 13 39 21 311828094191801 1/26/94 8/30/95 12 16 47 23 312216094280601 8/25/94 2/14/97 12 16 48 29 06100100 2/26/91 7/16/92 6 8 21 13 06100200 8/20/90 7/15/92 9 12 59 24

Table 4C-14. Summary of Surface Chloride Data for Segment 0610 Station ID Start Date End Date Chloride (mg/L) Number of Minimum Maximum Average Number of Observations Exceedancesa 14907 8/21/96 8/21/96 1 10.0 10.0 10.0 0 14906 8/21/96 8/21/96 1 18.0 18.0 18.0 0 310437094065501 1/25/94 2/13/97 9 12.0 21.0 15.1 0 311828094191801 1/26/94 2/13/97 10 12.0 30.0 18.7 0 312216094280601 1/26/94 2/14/97 9 10.0 69.0 35.9 0 06100100 2/26/91 7/16/92 4 4.0 13.0 9.5 0 06100200 8/20/90 7/15/92 5 8.0 36.0 23.4 0 aObservations compared to the water quality criterion of 100 mg/L for segment 0610 (Source: Texas Administrative Code 307.10(1)).

Table 4C-15. Summary of Surface Sulfate Data for Segment 0610 Station ID Start Date End Date Sulfate (mg/L) Number of Minimum Maximum Average Number of Observations Exceedancesa 14907 8/21/96 8/21/96 1 12 12 12 0 14906 8/21/96 8/21/96 1 20 20 20 0 310437094065501 1/25/94 2/13/97 9 14 21 17 0 311828094191801 1/26/94 2/13/97 10 14 31 20 0 312216094280601 1/26/94 2/14/97 9 12 50 29 0 06100100 2/26/91 7/16/92 4 21 28 24 0 06100200 8/20/90 7/15/92 4 19 28 24 0 aObservations compared to the water quality criterion of 100 mg/L for segment 0610 (Source: Texas Administrative Code 307.10(1)).

June 2003 4C-5 Historical Data Review for Sam Rayburn Reservoir

Table 4C-16. Summary of TSS and TDS Data for Segment 0610 Station ID Start Date End Date TSS (mg/L) Number of Minimum Maximum Average Observations 14907 8/21/96 8/21/96 1 25.0 25.0 25.0 14906 8/21/96 8/21/96 1 3.0 3.0 3.0 06100100 2/26/91 7/16/92 6 2.0 7.0 3.3 06100200 8/20/90 7/15/92 9 4.0 19.0 7.4 Station ID Start Date End Date TDS (mg/L) Number of Minimum Maximum Average Number of Observations Exceedancesa 14907 8/21/96 8/21/96 1 144.0 144.0 144.0 0 14906 8/21/96 8/21/96 1 118.0 118.0 118.0 0 aObservations compared to the water quality criterion of 400 mg/L for segment 0610 (Source: Texas Administrative Code 307.10(1))

Table 4C-17. Summary of Surface Water Temperature Data for Segment 0610 Station ID Start Date End Date Water Temperature (°F) Number of Minimum Maximum Average Number of Observations Exceedancesa 14907 8/21/96 8/21/96 1 87.1 87.1 87.1 0 14906 8/21/96 12/10/96 2 84.9 84.9 84.9 0 310437094065501 1/25/94 2/13/97 10 50.0 89.6 67.5 0 310802094112201 1/26/94 2/13/97 9 50.0 88.7 67.1 0 310816094041401 1/25/94 2/13/97 10 50.0 88.7 68.5 0 311000094010301 1/25/94 2/13/97 10 50.9 93.2 70.0 1 311039094141201 1/26/94 2/13/97 9 50.0 87.8 67.0 0 311137094051401 1/25/94 2/13/97 10 50.0 91.4 69.6 0 311804094234901 1/26/94 2/13/97 9 50.0 88.7 68.0 0 311817094190701 1/26/94 2/13/97 10 49.1 88.7 68.7 0 311828094191801 1/26/94 2/13/97 10 50.0 88.7 67.7 0 312216094280601 1/26/94 2/14/97 9 48.2 88.7 66.3 0 06100100 2/26/91 7/16/92 4 53.4 87.8 70.8 0 06100200 8/20/90 7/15/92 5 55.6 89.2 75.6 0 a Observations compared to the water quality criterion of 93 °F for segment 0610 (Source: Texas Administrative Code 307.10(1)).

June 2003 4C-6 Historical Data Review for Sam Rayburn Reservoir

Table 4C-18. Summary of the pH data for segment 0610 Station ID Start Date End Date pH Number of Minimum Maximum Average Number of Observations Exceedancesa

14907 8/21/96 8/21/96 2 6.7 7.3 7.0 0 14906 8/21/96 12/10/96 12 6.6 7.7 7.0 0 310437094065501 1/25/94 2/13/97 81 6.5 8.2 7.0 0 310802094112201 1/26/94 2/13/97 75 6.4 8.1 7.0 0 310816094041401 1/25/94 2/13/97 56 6.4 8.1 7.0 0 311000094010301 1/25/94 2/13/97 36 6.3 8.0 7.0 0 311039094141201 1/26/94 2/13/97 64 6.5 8.2 7.0 0 311137094051401 1/25/94 2/13/97 39 6.5 8.3 7.0 0 311804094234901 1/26/94 2/13/97 43 6.4 8.7 7.0 1 311817094190701 1/26/94 2/13/97 38 6.4 8.5 6.9 0 311828094191801 1/26/94 2/13/97 63 6.4 8.6 7.0 1 312216094280601 1/26/94 2/14/97 30 6.4 8.5 6.9 0 06100100 2/26/91 7/16/92 65 6.4 7.5 6.8 0 06100200 8/20/90 7/15/92 40 6.5 7.6 7.1 0 aObservations compared to the water quality criterion of pH 6–8.5 for segment 0610 (Source: Texas Administrative Code 307.10(1)).

Table 4C-19. Summary of Conductivity Data for Segment 0610 Station ID Start Date End Date Conductivity (µmos) Number of Minimum Maximum Average Observations 14907 8/21/1996 8/21/1996 2 130 131 131 14906 8/21/1996 12/10/1997 13 151 168 157 310437094065501 1/25/1994 2/13/1997 81 100 165 136 310802094112201 1/26/1994 2/13/1997 75 115 180 141 310816094041401 1/25/1994 2/13/1997 56 100 210 133 311000094010301 1/25/1994 2/13/1997 36 95 155 128 311039094141201 1/26/1994 2/13/1997 64 120 180 144 311137094051401 1/25/1994 2/13/1997 39 100 155 125 311804094234901 1/26/1994 2/13/1997 43 100 325 189 311817094190701 1/26/1994 2/13/1997 38 85 190 130 311828094191801 1/26/1994 2/13/1997 63 115 280 161 312216094280601 1/26/1994 2/14/1997 30 100 435 234 06100100 2/26/1991 7/16/1992 65 103 159 122 06100200 8/20/1990 7/15/1992 40 131 305 184

June 2003 4C-7 Historical Data Review for Sam Rayburn Reservoir

APPENDIX 4D Dissolved Oxygen Depth Profiles for Segment 0610 (STORET Data)

June 2003 4D-1 Historical Data Review for Sam Rayburn Reservoir

Appendix 4D presents water temperature and dissolved oxygen profile data for five water quality monitoring stations in the Sam Rayburn Reservoir. These five stations were chosen to represent the dissolved oxygen concentrations in various parts of the reservoir (upper, middle, lower, Attoyac Bayou arm, and Ayish Bayou arm). The five stations are presented in figure 4D-1.

W E

31221609428060 X(

X( 31182809419180

06100100 X( 31113709405140

X( Dissolved Oxygen Profile Stations S X( am Sam Rayburn Reservoir R ay bu rn R 0 10 20 Miles es er vo ir

X( 31043709406550 Data Sources: EPA's BASINS EPA's STORET Map Projection: Albers Equal Area

Figure 4D-1. Location of the five representative dissolved oxygen monitoring stations

Water temperature profile data were included for each station to show where the mixed layer was for each sample date. Texas water quality criteria for dissolved oxygen require that grab samples in the mixed layer meet the 3.0 mg/L dissolved oxygen criterion (see section 1.3). The mixed layer is defined as the portion of the water column from the surface to the depth at which water temperature decreases by greater than 0.5°C (TNRCC 2002). Table 4D-1 presents the mixed layer depth at each of the stations presented in this appendix on dates with dissolved oxygen observations less than 3.0 mg/L.

June 2003 4D-2 Historical Data Review for Sam Rayburn Reservoir

Table 4D-1. Mixed Layer Depth at Stations with Dissolved Oxygen Observations below 3.0 mg/L Date of Dissolved Oxygen Station ID Depth of Mixed Layer Observations Below 3.0 mg/L

312216094280601 None N/A

8/30/95 10 feet 311828094191801 8/22/96 30 feet

6/24/91 4 feet 06100100 7/16/92 35 feet

8/29/95 10 feet 311137094051401 8/21/96 20 feet

8/29/95 10 feet 310437094065501 8/21/96 10 feet

Figures 4D-2 through 4D-11 present the water temperature and dissolved oxygen data at five representative stations throughout the reservoir. None of the dissolved oxygen observations at these stations are exceeding the 3.0 mg/L criterion in the mixed layer based on water temperature.

June 2003 4D-3 Historical Data Review for Sam Rayburn Reservoir

Water Temperature (C) 0 5 10 15 20 25 30 35 0

5 1/27/1994 10 4/21/1994 8/25/1994 15 2/9/1995 20 4/19/1995 8/30/1995

Depth (ft) 25 2/14/1996 30 4/25/1996 2/14/1997 35

Figure 4D-2. Water temperature profile data for Sam Rayburn Reservoir at station 312216094280601 in the upper portion of the reservoir

Dissolved Oxygen at Station 312216094280601

DO (mg/L)

0 2 4 6 8 10 12 1/27/94 0 4/21/94 5 8/25/94 2/9/95 10 4/19/95 15 8/30/95 20 2/14/96

Depth (ft) 4/25/96 25 2/14/97 30 Criteria

Figure 4D-3. Dissolved oxygen profile data for Sam Rayburn Reservoir at station 31221609428060 in the upper portion of the reservoir

June 2003 4D-4 Historical Data Review for Sam Rayburn Reservoir

Temp (C) 0 5 10 15 20 25 30 35 0 1/26/1994 10 4/21/1994 20 8/25/1994 2/9/1995 30 4/19/1995 40 8/30/1995 2/14/1996 Drpth (ft) 50 4/24/1996 60 8/22/1996 2/13/1997 70

Figure 4D-4. Water temperature profile data for Sam Rayburn Reservoir at station 311828094191801 on the Attoyac Bayou arm

Dissolved Oxygen at Station 311828094191801

DO (mg/L) 1/26/94 0 2 4 6 8 10 12 0 4/21/94 8/25/94 10 2/9/95 20 4/19/95 8/30/95 30 2/14/96 40 4/24/96 Depth (ft) 50 8/22/96 2/13/97 60 Criteria 70

Figure 4D-5. Dissolved oxygen profile data for Sam Rayburn Reservoir at station 311828094191801 on the Attoyac Bayou arm

June 2003 4D-5 Historical Data Review for Sam Rayburn Reservoir

Water Temperature (C) 0 10 20 30 40 0

20 2/26/1991 30 6/24/1991 40 2/27/1992 Depth (ft) 7/16/1992 50

Figure 4D-6. Water temperature profile data for Sam Rayburn Reservoir at station 06100100 in the middle portion of the reservoir

Dissolved Oxygen at Station 06100100

DO (mg/L) 0 2 4 6 8 10 0

20 2/26/91 6/24/91 30 2/27/92 7/16/92 Depth (ft) 40 Criteria

Figure 4D-7. Dissolved oxygen profile data for Sam Rayburn Reservoir at station 06100100 in the middle portion of the reservoir

June 2003 4D-6 Historical Data Review for Sam Rayburn Reservoir

Water Temperature (C) 0 10 20 30 40 0 5 1/25/1994 4/20/1994 10 8/24/1994 15 2/8/1995 20 4/18/1995 25 8/29/1995 Depth (ft) 30 2/13/1996 4/23/1996 35 8/21/1996 40 2/13/1997 45

Figure 4D-8. Water temperature profile data for Sam Rayburn Reservoir at station 311137094051401 on the Ayish Bayou arm of the reservoir

Dissolved Oxygen at Station 311137094051401

DO (mg/L) 0 5 10 15 0 1/25/94 5 4/20/94 10 8/24/94 15 2/8/95 4/18/95 20 8/29/95 2/13/96 Depth (ft) 25 8/21/96 30 2/13/97 35 Criteria

Figure 4D-9. Dissolved oxygen profile data at Sam Rayburn Reservoir at station 311137094051401 on the Ayish Bayou arm of the reservoir

June 2003 4D-7 Historical Data Review for Sam Rayburn Reservoir

Water Temperature (C) 0 10 20 30 40 1/25/1994 0 4/20/1994 10 8/24/1994 20 2/8/1995 30 4/18/1995 40 8/29/1995 50 2/14/1996 60 Depth (ft) 4/23/1996 70 8/21/1996 80 2/13/1997 90 100

Figure 4D-10. Water temperature data for Sam Rayburn Reservoir at station 310437094065501 in the lower portion of the reservoir

Dissolved Oxygen at Station 310437094065501

DO (mg/L) 0 2 4 6 8 10 12 14 0 1/25/94 10 4/20/94 20 8/24/94 30 2/8/95 4/18/95 40 8/29/95 50 2/14/96 Depth (ft) 60 8/21/96

70 2/13/97 Criteria 80

Figure 4D-11. Dissolved oxygen profile data for Sam Rayburn Reservoir at station 310437094065501 in the lower portion of the reservoir

June 2003 4D-8 Historical Data Review for Sam Rayburn Reservoir

5.0 Stream Characteristics

This section discusses the flow data available in the Sam Rayburn Reservoir watershed as well as the water quality data available for the tributaries to the reservoir. Water quality monitoring data were downloaded from the TRACS and STORET databases and analyzed. Analysis of the TRACS data is presented in Section 5.2 and the analysis of the STORET data is presented in Section 5.3.

5.1 Flow

Flow data for the stream segments in the Sam Rayburn Reservoir watershed were compiled from U.S. Geological Survey (USGS) stations, as well as other water quality monitoring stations.

5.1.1 Monitoring Stations

USGS has historically maintained 12 continuous-flow stations in the Sam Rayburn Reservoir watershed. Stations 08034500, 08036500, 08038000, and 08039100 are still active. Table 5-1 presents a summary of the available daily flow data for these stations, and Figure 5-1 shows the locations of the stations. Stations 08037500, 08039000, and 08039500 are not included in Figure 5-1 because their exact locations are unknown. In addition to the USGS stations there are 52 water quality stations with recorded instantaneous-flow data in TRACS. These stations and a summary of their data are presented in Table 5-2.

June 2003 5-1 Historical Data Review for Sam Rayburn Reservoir

Table 5-1. Summary of Flow Data Available at USGS Gage Stations in the Sam Rayburn Reservoir Watershed

Start Flow (cfs) Station Location End Date Date Average Min Max

08033700 Striker Creek near Summerfield, TX 10/1/1940 9/30/1949 200.3 0.7 9,640

E. Fork Angelina River near Cushing, 08033900 1/1/1964 9/30/1989 117.0 1 8,870 TX

08034500 Mud Creek near Jacksonville, TX 6/1/1939 9/30/2001 253.6 0 22,700

08036500 Angelina River near Alto, TX 10/1/1940 9/30/2001 877.6 0 41,600

08037000 Angelina River near Lufkin, TX 10/1/1923 9/30/1979 117.5 0.8 36,800

08037050 Bayou Lanana at Nacogdoches, TX 10/1/1964 9/30/1993 32.4 0 5730

Arenoso Creek near San Augustine, 08037500 6/1/1938 9/30/1940 61.3 3.3 1,220 TX

08038000 Attoyac Bayou near Chireno, TX 2/1/1924 9/30/1989 434.9 0 26,800

08038500 Angelina River near Zavalla, TX 10/1/1951 1/31/1965 1,786.2 22 36,700

08039000 Ayish Bayou at San Augustine, TX 4/1/1925 8/31/1925 3.5 1.3 18

08039100 Ayish Bayou at San Augustine, TX 3/1/1959 9/30/1985 83.5 0 6,890

08039500 Angelina River near Ebenezer, TX 4/1/1928 9/30/1973 2,751.3 0 49,300

June 2003 5-2 Historical Data Review for Sam Rayburn Reservoir

. M u d C r e e k

t r i k

e r 08033700 &V &V C elina 08034500 r ng M . A C e E.F A u e er r Riv t k t e d o e y k &V08033900 a c

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08036500 &V A 08037050 n &V R g e a i v li n u n a e o r a 08038000 N y &V a

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08037000 &V 08039100

y Sam Rayburn i

h Reservoir u

08038500

08039500 &V &V &V USGS Gages 08039580 Reach File, Version 1 Sam Rayburn Reservoir watershed

0 20 40 Miles

W E Sources: EPA's BASINS S USGS

Figure 5-1. Location of USGS Gages in the Sam Rayburn Reservoir Watershed

June 2003 5-3 Historical Data Review for Sam Rayburn Reservoir

Table 5-2. Summary of Flow Data Available at Water Quality Monitoring Stations InstantaneousFlow (cfs) Station Location Start Date End Date # Avg Min Max 10474 La Nana Bayou at CR 526 3/20/1974 11/14/1996 57 38.2 2 324 10475 La Nana Bayou at Loop 224 11/14/1996 2/11/2002 21 25.3 1.1 88 10483 Ayish Bayou at US 96 11/20/1974 6/20/1979 21 15.7 1.61 40 10504 Paper Mill Creek 1/27/1986 5/1/1987 9 45.8 22.3 88.3 10532 Mud Creek at US 84 9/5/1996 9/6/1996 1 33 33 33 10535 Mud Creek on Unnamed CR 8/26/1986 8/26/1986 1 9.6 9.6 9.6 10537 Mud Creek at FM 2138 8/26/1986 8/26/1986 1 3.5 3.5 3.5 10538 West Mud Creek at FM 3052 8/26/1986 9/29/1987 2 13.8 9 18.6 10539 West Mud Creek at FM 344 6/26/1986 6/21/1995 13 30.2 8.8 60.4 10540 West Mud Creek at FM 346 9/29/1987 7/25/2001 19 13.3 3.6 26 10541 West Mud Creek at FM 2813 9/29/1987 9/29/1987 1 8.5 8.5 8.5 10542 West Mud Creek, Tyler WWTP 10/27/1998 8/30/1999 10 4.3 1.1 5.9 10543 West Mud Creek Holly Trees CC 8/26/1986 2/16/1989 9 3.7 1.3 12.5 10552 E. Fork Angelina River at FM 225 6/21/1995 6/21/1995 1 34 34 34 10613 Sam Rayburn Reservoir at SH 103 12/9/1981 12/9/1981 1 155.71 155.71 155.71 10627 Angelina River at US 59 9/20/1973 2/18/1998 95 1051.9 24.7 8000 10630 Angelina River at FM 21 11/17/1997 2/5/2001 22 994.5 13.6 4248 10633 Angelina River at SH 204 9/5/1996 7/12/2000 2 26.2 5.3 47 10635 Angelina River at SH 1798 5/1/2001 7/11/2001 2 35.0 31 39 10636 Attoyac Bayou at SH 21 9/19/1973 8/26/1999 95 450.7 22 2500 13674 Bowles Creek at SH 64 11/2/1981 8/27/1985 34 14.4 0 326 13788 East Fork Angelina River 10/26/1993 11/6/1996 6 10.6 3.6 15 14470 Angelina River at US 84 10/31/1995 6/25/1997 7 37.6 5.7 75 14477 Mud Creek at US 79 10/16/1995 6/12/1996 5 35.6 9.2 107 15357 Turkey Creek at FM 705 11/7/1996 8/19/1997 4 2.4 0.44 6.1 15358 Sandy Creek at FM 705 11/7/1996 8/19/1997 4 4.5 1.1 8.3 15359 Chiamon Bayou at FM 1751 11/7/1996 8/19/1997 4 1.1 0.09 3.1 15360 Chinquapin Creek FM 1751 11/7/1996 8/19/1997 4 1.4 0.1 3.5 15361 Ayish Bayou at SH 103 11/7/1996 7/17/2001 9 11.8 1 59 15362 Caney Creek at SH 147 11/12/1996 8/21/1997 4 6.9 0.94 15 15363 Venado Creek at SH 147 11/12/1996 8/21/1997 4 12.0 2.4 23 15364 Ayish Bayou at SH 147 8/9/1996 8/21/1997 6 10.6 1.93 21 15365 Ayish Bayou at FM 3230 11/12/1996 8/21/1997 4 4.9 0.51 11 15366 Carrizo Creek at FM 2213 11/12/1996 8/21/1997 4 3.1 0.28 11 15522 Sam Rayburn near Veach Basin 12/14/1995 12/14/1995 1 0.56 0.56 0.56 15806 Bromley Creek near Henderson 8/27/1996 10/21/1997 2 1.1 0.587 1.7 15807 Shawnee Creek at FM 225 8/27/1996 10/21/1997 2 0.1 0 0.103

June 2003 5-4 Historical Data Review for Sam Rayburn Reservoir

Table 5-2. Summary of flow data available at water quality monitoring stations (Continued) Instantaneous Flow (cfs) Station Location Start Date End Date # Avg Min Max 16082 Terrapin Creek at CR 234 11/19/1997 3/24/1998 5 0.2 0.02 0.74 16083 Waffelow Creek at SH 95 11/19/1997 5/27/1998 5 5.2 2.3 13 16084 Terrapin Creek at SH 95 11/19/1997 5/27/1998 7 13.9 3 32 16085 Waffelow Creek at FM 1878 11/19/1997 5/27/1998 7 0.9 0.08 2.8 16289 Everett Branch 10/12/1998 8/18/1999 6 2.7 0.48 7.23 16291 Wooten Creek 12/9/1998 8/18/1999 4 13.2 1 33.09 16294 Sulphur Springs Branch 10/12/1998 8/18/1999 6 11.8 1.4 33.64 16298 Ragsdale Creek 10/27/1998 5/31/2000 23 1.4 0.13 4.3 16300 Jones Creek 10/13/1998 8/18/1999 7 4.7 1 14.37 16301 La Nana Bayou Loop 224 12/28/1998 12/28/1998 1 6.89 6.89 6.89 16302 Beech Creek at CR 950 10/13/1998 8/18/1999 3 12.5 7.2 13.34 16303 Dill Creek at FM 2783 12/14/1998 6/22/1999 4 3.6 0.02 10.43 16586 Mud Creek at SH 110 7/15/1999 10/29/2001 3 4.0 1.7 5.7 16587 Caney Creek at SH 13 7/14/1999 7/14/1999 1 0.1 0.1 0.1 17103 Mud Creek at SH 135 12/5/2000 10/29/2001 2 36.4 24.9 47

5.1.2 Temporal Summary

The annual mean daily flows for the entire period of record for the USGS gaging stations are presented in Table 5-3. These data demonstrate how flow within the Sam Rayburn Reservoir watershed fluctuates during wet and dry years. Mean monthly flow for seven USGS stations was calculated to illustrate flow patterns in the main tributaries of the watershed over the course of the year. Results are graphically shown in Figures 5-2 through 5-8 indicate a significant increase in flow during the late spring and early summer months, a subsequent decrease during the late summer and early fall months, and a slow increase in flow during the winter months. This trend is consistent with regional rain patterns and vegetative growth.

Table 5-3. Annual Mean Daily Flow Annual Mean Annual Mean Annual Mean Annual Mean Daily Year Daily Flow Year Daily Flow Year Daily Flow Year Flow (cfs) (cfs) (cfs) (cfs) USGS 08033700 Striker Creek near Summerfield, TX 1941 217 1944 278 1945 301 1947 179 1942 158 1943 57.2 1946 302 1948 117 USGS 08033900 East Fork Angelina River near Cushing, TX 1964 34 1971 43.2 1977 58.6 1983 180 1965 76 1972 54.7 1978 65.1 1984 119 1966 97.1 1973 210 1979 243 1985 150 1967 21.4 1974 147 1980 161 1986 135 1968 165 1975 142 1981 66.3 1987 125 1969 158 1976 106 1982 147 1988 88 1970 51.1 USGS 08034500 Mud Creek near Jacksonville, TX 1940 290 1950 258 1960 370 1970 157 1941 339 1951 82.4 1961 414 1971 48.3

June 2003 5-5 Historical Data Review for Sam Rayburn Reservoir

Annual Mean Annual Mean Annual Mean Annual Mean Daily Year Daily Flow Year Daily Flow Year Daily Flow Year Flow (cfs) (cfs) (cfs) (cfs) 1942 263 1952 184 1962 250 1972 78.2 1943 114 1953 249 1963 59.4 1973 542 1944 545 1954 120 1964 34.5 1974 365 1945 628 1955 152 1965 129 1975 274 1946 644 1956 93.7 1966 287 1976 261 1947 400 1957 427 1967 38.5 1977 212 1948 235 1958 299 1968 232 1978 66.9 1949 149 1959 323 1969 312 USGS 08036500 Angelina River near Alto, TX 1943 339 1970 545 1981 318 1991 2,049 1960 1,174 1971 201 1982 709 1992 1,207 1961 1,641 1972 361 1983 1,135 1993 1,325 1962 878 1973 1,637 1984 571 1994 1,162 1963 241 1974 1,133 1985 866 1995 1,350 1964 147 1975 974 1986 774 1996 297 1965 466 1976 977 1987 877 1997 1,365 1966 901 1977 577 1988 584 1998 1,229 1967 145 1978 269 1989 1,404 1999 1,141 1968 1,076 1979 1,463 1990 1,224 2000 605 1969 1,350 1980 863 USGS 08037000 Angelina River near Lufkin, TX 1924 1,661 1943 376 1955 653 1967 193 1925 906 1944 2,389 1956 401 1968 1,472 1926 1,176 1945 2,475 1957 1,956 1969 1,739 1927 1,190 1946 2,549 1958 1,424 1970 629 1928 612 1947 1,744 1959 974 1971 222 1929 1,021 1948 958 1960 1,411 1972 500 1930 1,174 1949 837 1961 2,106 1973 2,134 1931 1,116 1950 1,442 1962 1,098 1974 1,500 1932 2,248 1951 398 1963 297 1975 1,366 1933 1,156 1952 662 1964 225 1976 1,153 1940 1,581 1953 1,452 1965 603 1977 714 1941 1,950 1954 428 1966 1,104 1978 353 1942 1,191 USGS 08037050 Bayou Lanana at Nacogdoches, TX 1965 19.7 1972 22.6 1978 15.1 1984 29.3 1966 28.9 1973 61.7 1979 97.3 1985 42.9 1967 4.99 1974 34.3 1980 25.9 1989 38.6 1968 54.5 1975 42.8 1981 14.5 1990 34.1 1969 45.5 1976 17.3 1982 46.7 1991 52.1 1970 8.62 1977 15.8 1983 40.2 1992 30.6 1971 3.64 USGS 08038000 Attoyac Bayou near Chireno, TX 1940 871 1951 175 1964 134 1975 570 1941 960 1952 230 1965 233 1976 289 1942 475 1953 694 1966 337 1977 260 1943 141 1956 135 1967 96 1978 303

June 2003 5-6 Historical Data Review for Sam Rayburn Reservoir

Annual Mean Annual Mean Annual Mean Annual Mean Daily Year Daily Flow Year Daily Flow Year Daily Flow Year Flow (cfs) (cfs) (cfs) (cfs) 1944 766 1957 606 1968 629 1979 968 1945 590 1958 564 1969 559 1980 565 1946 721 1959 306 1970 170 1981 345 1947 513 1960 468 1971 92.8 1982 601 1948 316 1961 694 1972 202 1983 776 1949 429 1962 291 1973 747 1984 477 1950 583 1963 118 1974 567 USGS 08038500 Angelina River near Zavalla, TX 1952 1,258 1956 680 1959 1,726 1962 1,884 1953 3,125 1957 3,278 1960 2,466 1963 588 1954 714 1958 2,633 1961 3,631 1964 672 1955 1,075 USGS 08039100 Ayish Bayou near San Augustine, TX 1960 90.4 1967 15.2 1973 190 1979 185 1961 151 1968 149 1974 154 1980 81 1962 45.9 1969 106 1975 131 1981 25.1 1963 26.5 1970 28 1976 46.7 1982 113 1964 53.8 1971 16.1 1977 43 1983 140 1965 31.4 1972 46.7 1978 80.8 1984 84.2 1966 71.4 USGS 08039500 Angelina River near Ebenezer, TX 1929 3,186 1937 2,028 1944 5,269 1966 550 1930 2,712 1938 2,494 1945 5,119 1967 381 1931 2,438 1939 1,917 1946 5,810 1968 2,021 1932 4,489 1940 4,109 1947 3,654 1969 3,659 1933 2,844 1941 5,326 1948 2,054 1970 787 1934 3,173 1942 2,857 1949 2,775 1971 437 1935 3,706 1943 769 1950 4,462 1972 896 1936 912

June 2003 5-7 Historical Data Review for Sam Rayburn Reservoir

Mean Monthly Flow East Fork of Angelina River at USGS 08033900

250

200

150

100 Flow (cfs)

0 Jan Feb Mar April May Jun Jul Aug Sep Oct Nov Dec Month

Figure 5-2. Mean Monthly Flow at USGS Gage 08033900 (East Fork Angelina River)

Mean Monthly Flow Mud Creek at USGS 08034500

600

500

400

300

Flow (cfs) 200

100

0 Jan Feb Mar April May Jun Jul Aug Sep Oct Nov Dec Months

Figure 5-3. Mean Monthly Flow at USGS Gage 08034500 (Mud Creek).

June 2003 5-8 Historical Data Review for Sam Rayburn Reservoir

Mean Monthly Flow Angelina River at USGS 08036500

1,800 1,600 1,400 1,200 1,000 800 Flow (cfs) 600 400 200 0 Jan Feb Mar April May Jun Jul Aug Sep Oct Nov Dec Months

Figure 5-4. Mean Monthly Flow for USGS Gage 08036500 (Angelina River).

Mean Monthly Flow Attoyac Bayou at USGS 08038000

800 700 600 500 400

Flow (cfs) 300 200 100 0 Jan Feb Mar April May Jun Jul Aug Sep Oct Nov Dec Month

Figure 5-5. Mean Monthly Flow at USGS Gage 08038000 (Attoyac Bayou)

June 2003 5-9 Historical Data Review for Sam Rayburn Reservoir

Mean Monthly Flow Angelina River at USGS 08037000

2,500

2,000

1,500

1,000 Flow (cfs)

500

0 Jan Feb Mar April May Jun Jul Aug Sep Oct Nov Dec Months

Figure 5-6. Mean Monthly Flow for USGS Gage 08037000 (Angelina River).

Mean Monthly Flow Ayish Bayou at USGS 08039100

180 160 140 120 100 80 Flow (cfs) 60 40 20 0 Jan Feb Mar April May Jun Jul Aug Sep Oct Nov Dec Months

Figure 5-7. Mean Monthly Flow for USGS Gage 08039100 (Ayish Bayou).

June 2003 5-10 Historical Data Review for Sam Rayburn Reservoir

Mean Monthly Flow Angelina River at USGS 08039500

6,000

5,000

4,000

3,000

Flow (cfs) 2,000

1,000

0 Jan Feb Mar April May Jun Jul Aug Sep Oct Nov Dec Months

Figure 5-8. Mean Monthly Flow for USGS Gage 08039500 (Angelina River)

5.2 TRACS Water Quality Data for Segments 0611 and 0612

Water quality monitoring data were queried from TCEQ’s TRACS database for the two segments that compose the portion of the Sam Rayburn Reservoir watershed upstream of the reservoir (segments 0611 and 0612). Most of the analyses focus on data from 1990 to the present, but 1980s data are included for some sites or segments with only limited data available for the years since 1990.

5.2.1 Monitoring Stations

The monitoring stations in segments 0611 and 0612 are listed in Table 5-4. For segment 0611, 54 monitoring stations were found in TRACS, whereas only eight stations were found for segment 0612. Figure 5-9 presents the locations of the TRACS monitoring stations.

June 2003 5-11 Historical Data Review for Sam Rayburn Reservoir

Table 5-4. Monitoring Stations in Segments 0611 and 0612 Station Station Location Segment 0611 10472 Lanana Bayou at Lowermost County Rd Crossing 10473 Lanana Bayou at Boozer Property upstream from South Pacific RR Bridge 10474 La Nana Bayou at Nacogdoches Cr526 10475 La Nana Bayou at Loop 224 S of Nacogdoches 10476 Lanana Bayou at FM 1878 10477 Keys Creek at Lowermost County Rd Crossing se of Jacksonville 10531 Striker Cr at County Rd Crossing ne of Reklaw 10532 Mud Creek at Us 84 sw of Reklaw 10535 Mud Creek on Unnamed County Rd, 2.5mi east of Tecula 10536 Mud Creek at Fm 2064 ne of Jacksonville 10537 Mud Creek at Fm2138, west of Troup 10538 West Mud Creek at FM3052, Approx. 4.5mi sw of the City of Troup and east of Bullard 10539 West Mud Creek at FM344 ne of Bullard 10540 West Mud Creek at FM 346 south of Tyler 10541 West Mud Creek at FM2813 south of Tyler 10542 West Mud Creek immediately upstream from Tyler 10543 West Mud Creek near south end of Holly Trees Country Club 10550 Anadarko Creek at FM 2753 10551 East Fork Angelina River at Lowermost County Rd Crossing 10552 East Fork Angelina River at FM 225 10624 Angelina River at River Crest Estates 10625 Angelina River Downstream from Southern Pacific RR Bridge, north of Kurth Lake 10626 Angelina River at Southern Pacific RR Bridge 10627 Angelina River Bridge on US 59 north of Lufkin 10628 Angelina River at SH 7 southwest of Nacogdoches 10629 Angelina River at FM 1911 southeast of Alto 10630 Angelina River at SH 21 east of Alto 10631 Angelina River at FM 343 east of Rusk 10632 Angelina River at County Rd Crossing Immediately Downstream from Mud Cr Confluence 10633 Angelina River at SH 204 west of Cushing 10634 Angelina River at FM 1662 west of Anadarko 10635 Angelina River at FM 1798 west of Laneville 13674 Bowles Creek at SH 64, 1.5 mi. west of Selman City 13788 East Fork Angelina River Approximately 5 mi sw of Mount Enterprise at CR 3218 14470 Angelina River at US 84 east of Reklaw 14477 Mud Creek at US 79 Between Jacksonville and New Summerfield 15801 Lake Nacogdoches in Main Pool near dam, 10 mi. west of Nacogdoches 15806 Bromley Creek, 1.0 mi south of US79 15807 Shawnee Creek at FM225, 1 mi. south of Henderson (Permit# Wq0010187-001) 16289 Everett Branch at Rusk CR3227, 0.6mi. downstream of US 84, west of Mount Enterprise 16290 East Fork Angelina River at Rusk CR3216, 1.9mi. downstream of US 84, sw of Henderson 16291 Wooten Creek at FM3055, sw of Mount Enterprise

June 2003 5-12 Historical Data Review for Sam Rayburn Reservoir

Station Station Location 16292 Ham Creek at Rusk CR3168, 1.4mi. upstream of FM2496, nw of Mount Enterprise 16294 Sulphur Springs Branch at Rusk CR3238 16298 Ragsdale Creek at Canada St. Immediately Upstream of Jacksonville 16300 Jones Creek at Nacogdoches CR817 16301 La Nana Bayou at Loop 224 16302 Beech Creek at Nacogdoches CR950, approx. 6mi. Ne of Cushing 16303 Dill Creek at FM2783, east of Cushing 16304 East Fork Angelina River at Nacogdoches CR3230, 2.3km north of Happy Valley 16586 Mud Creek at SH110, 6.0km nw of City of Troup 16587 Caney Creek at SH13, 0.80km se of City of Troup 16950 Lake Stricker Approx 0.5mi North of East End of Dam 17103 Mud Creek at SH135, Approx. 3.5mi sww of the City of Troup Segment 0612 10636 Attoyac Bayou at SH 21 east of Chireno 15253 Attoyac Bayou at SH 7 Approximately 1.75 Km ne of Martinsville

15802 Pinkston Reservoir in Main Pool near dam, 12 mi. sw of Center 16076 Attoyac Bayou at US 59 ne of Garrison 16082 Terrapin Creek at Nacogdoches Cr234, 5 mi. nw of Martinsville 16083 Waffelow Creek at SH95, 4 mi. north of Martinsville 16084 Terrapin Creek at SH95, 1 mi. south of Martinsville 16085 Waffelow Creek at FM1878, 8.5 mi. ne of Loop 224 in Nacogdoches

June 2003 5-13 Historical Data Review for Sam Rayburn Reservoir

10542

10540 U% 16586 10539 U% 15806 16587 U% U% 15807 10538 U% U% 17103 U%U% U% 16294

10536 16290 14477 16292 U% 10635 U% 16291 U% 16950 U% U% U% 16289 16304 16076 U% 16298 14470 U% U% U% 16302 $T U% U% U% U% U% U% 10532 U% 16083 U% U% 10552 16300 10633 16085 15802 10551 U% 16303 $T 13788 $T $T 16301 15253 $T $T U% U% $T 15801 10630 10475 16084 U% U% 16082 10474 U% $T 10627

Sample Station U% 611 $T 612 Basin River or Stream County Boundary Reservoir

Figure 5-9. Locations of the TRACS water quality monitoring stations

June 2003 5-14 Historical Data Review for Sam Rayburn Reservoir

5.2.2 Water Quality Data Analysis

5.2.2.1 Dissolved Oxygen and Nutrients

Segment 0611: Dissolved Oxygen

There are 436 records available for grab dissolved oxygen in surface waters for segment 0611 and its subsegments (period of record from January 1990 to November 2002). The data range from 1.3 mg/L to 14.5 mg/L. Of the 436 records, there were 3 exceedances of the 3.0 mg/L criterion. The data are presented in Table 5A-1. Tables 5A-1 through 5A-38 are presented in Appendix 5A at the end of Section 5.0 because if their large size.

There are 21 records available for 24-hour minimum dissolved oxygen in surface waters for segment 0611 and its subsegments (period of record from October 1997 to August 2002). The data range from 1.3 mg/L to 8.2 mg/L. There was one exceedance of the 3.0 mg/L criterion. The data are presented in Table 5A-2.

There are 21 records available for 24-hour average dissolved oxygen in surface waters for segment 0611 and its subsegments (period of record from October 1997 to August 2002). The data range from 2.9 mg/L to 9.0 mg/L. There were three exceedances of the 5.0 mg/L criterion. The data are presented in Table 5A-3.

Segment 0612: Dissolved Oxygen

There are 108 records available for grab dissolved oxygen in surface waters for segment 0612 and its subsegments (period of record from June 1990 to July 2002). The data range from 4.9 mg/L to 12.8 mg/L. There were no exceedances of the 3.0 mg/L criterion. The data are presented in Table A5-1.

There are two records available for 24-hour minimum dissolved oxygen in surface waters for segment 0612 and its subsegments (period of record from May 2001 to August 2001). The data range from 5.91 mg/L to 7.03 mg/L. There were no exceedances of the 3.0 mg/L criterion. The data are presented in Table 5A-2.

There are two records available for 24-hour average dissolved oxygen in surface waters for segment 0612 and its subsegments (period of record from May 2001 to August 2001). The data range from 6.08 mg/L to 7.1 mg/L. There were no exceedances of the 5.0 mg/L criterion. The data are presented in Table 5A-3.

Chlorophyll a and Secchi Depth

Segment 0611: Chlorophyll a

There are 105 records available for chlorophyll a in surface waters for segment 0611 and its subsegments (period of record from January 1990 to November 2002). The data range from 1.0 µg/L to 18.7 µg/L. There were 102 samples that were higher than the the 0.566 µg/L EPA reference criterion and 2 samples that were higher than the 11.6 µg/L TCEQ screening level. The

June 2003 5-15 Historical Data Review for Sam Rayburn Reservoir data are presented in Table 5A-4.

Segment 0612: Chlorophyll a

There are 35 records available for chlorophyll a in surface waters for segment 0612 and its subsegments (period of record from June 1990 to August 2002). The data range from 1.0 µg/L to 10.2 µg/L. There were 34 samples that were higher than the 0.566 µg/L EPA reference criterion and no samples that were higher than the 11.6 µg/L TCEQ screening level. The data are presented in Table 5A-4.

Segment 0611: Secchi Depth

There are 198 records available for Secchi depth in surface waters for segment 0611 and its subsegments (period of record from January 1990 to November 2002). The data range from 0.1 meter to 1.8 meters. There are no water quality criteria for Secchi depth in streams. The data are presented in Table 5A-5.

Segment 0612: Secchi Depth

There are 33 records available for Secchi depth in surface waters for segment 0612 and its subsegments, with a period of record from June 1990 to August 2002. The data range from 0.18 meter to 1.22 meters. There are no water quality criteria for Secchi depth in streams. The data are presented in Table 5A-5.

Nutrients

Segment 0611: Total Phosphorus

There are 254 records available for total phosphorus in surface waters for segment 0611 and its subsegments (period of record from January 1990 to November 2002). The data range from 0.006 mg/L to 8.3 mg/L. There were 225 samples that were higher than the 0.05 mg/L EPA reference criterion and 52 observations that were higher than the 0.8 mg/L TCEQ screening level. The data are presented in Table 5A-6.

Segment 0612: Total Phosphorus

There are 64 records are available for total phosphorus in surface waters for segment 0612 and its subsegments (period of record from January 1990 to November 2002). The data range from 0.01 mg/L to 1.622 mg/L. There were 42 observations that were higher than the 0.05 mg/L EPA reference criterion and 3 observations that were higher than the 0.8 mg/L TCEQ screening level. The data are presented in Table 5A-6.

Segment 0611: Orthophosphorus

There are 173 records available for orthophosphorus in surface waters for segment 0611 and its subsegments (period of record from January 1990 to August 2002). The data range from 0.001 mg/L to 4.12 mg/L. There were 31 observations that were higher than the 0.5 mg/L TCEQ

June 2003 5-16 Historical Data Review for Sam Rayburn Reservoir screening level for orthophosphorus. The data are presented in Table 5A-7.

Segment 0612: Orthophosphorus

There are 66 records available for ortho-phosphorus in surface waters for segment 0612 and its subsegments (period of record from June 1990 to July 2002). The data range from 0.01 mg/L to 0.87 mg/L. There were two observations that were higher than the 0.5 mg/L TCEQ screening level. The data are presented in Table 5A-7.

Segment 0611: Total Nitrogen

There are 23 records available for total nitrogen in surface waters for segment 0611 and its subsegments (period of record from February 1993 to January 1998). The data range from 0.36 mg/L to 6.7 mg/L. There were 15 observations that were higher than the 0.507 mg/L EPA reference criterion. The data are presented in Table 5A-8.

Segment 0612: Total Nitrogen

There are 9 records are available for total nitrogen in surface waters for segment 0612 and its subsegments (period of record from August 1993 to January 1998). The data range from 0.11 mg/L to 1.05 mg/L. There were five observations that were higher than the 0.507 mg/L EPA reference criterion. The data are presented in Table 5A-8.

Segment 0611: Nitrate/Nitrite

There are 253 records available for nitrate/nitrite in surface waters for segment 0611 and its subsegments (period of record from January 1990 to August 2002). The data range from 0.01 mg/L to 13.4 mg/L. There were 247 observations that were higher than the 0.067 mg/L EPA reference criterion and 32 observations that were higher than the 2.76 mg/L TCEQ screening level. The data are presented in Table 5A-9.

Segment 0612: Nitrate/Nitrite

There are 47 records available for nitrate/nitrite in surface waters for segment 0612 and its subsegments (period of record from June 1991 to July 2002). The data range from 0.02 mg/L to 5.4 mg/L. There were 45 observations that were higher than the 0.067 mg/L EPA reference criterion and 2 observations that were higher than the 0.2.76 mg/L TCEQ screening level. The data are presented in Table 5A-9.

Segment 0611: Total Kjeldahl Nitrogen

There are 93 records available for TKN in surface waters for segment 0611 and its subsegments (period of record from February 1993 to November 2002). The data range from 0.16 mg/L to 2.31 mg/L. There were 53 observations that were higher than the 0.44 mg/L EPA reference criterion. The data are presented in Table 5A-10.

June 2003 5-17 Historical Data Review for Sam Rayburn Reservoir

Segment 0612: Total Kjeldahl Nitrogen

There are 38 records available for TKN in surface waters for segment 0612 and its subsegments (period of record from August 1993 to August 2002). The data range from 0.04 mg/L to 0.94 mg/L. There were 14 observations that were higher than the 0.44 mg/L EPA reference criterion. The data are presented in Table 5A-10.

Segment 0611: Ammonia

There are 321 records available for ammonia in surface waters for segment 0611 and its subsegments (period of record from January 1990 to November 2002). The data range from 0.01 mg/L to 8.95 mg/L. There were 37 samples that were higher than the 0.17 mg/L TCEQ screening level. The data are presented in Table 5A-11.

Segment 0612: Ammonia

There are 75 records available for ammonia in surface waters for segment 0612 and its subsegments (period of record from June 1990 to August 2002). The data range from 0.01 mg/L to 1.4 mg/L. There were four observations that were higher than the 0.17 mg/L TCEQ screening level. The data are presented in Table 5A-11.

Segment 0611: Biochemical Oxygen Demand

There are 145 records available for BOD in surface waters for segment 0611 and its subsegments (period of record from January 1994 to May 2000). The data range from 0.6 mg/L to 15.4 mg/L. There are no water quality criteria for BOD. The data are presented in Table 5A-12.

Segment 0612: Biochemical Oxygen Demand

There are 48 records available for BOD in surface waters for segment 0612 and its subsegments (period of record from November 1998 to April 2000). The data range from 0.5 mg/L to 2.5 mg/L. There are no water quality criteria for BOD. The data are presented in Table 5A-12.

Segment 0611: Total Organic Carbon

There are 138 records available for TOC in surface waters for segment 0611 and its subsegments (period of record from January 1990 to November 2002). The data range from 1 mg/L to 19 mg/L. There are no water quality criteria for TOC. The data are presented in Table 5A-13.

Segment 0612: Total Organic Carbon

There are 74 records available for TOC in surface waters for segment 0612 and its subsegments (period of record from June 1990 to August 2002). The data range from 1 mg/L to 14 mg/L. There are no water quality criteria for TOC. The data are presented in Table 5A-13.

June 2003 5-18 Historical Data Review for Sam Rayburn Reservoir

5.2.2.2 Metals and Dioxin

Aluminum

There are 96 records available for dissolved aluminum concentrations measured in the surface waters (0.3 m) of segment 0611 and its subsegments (period of record: January 1985 to July 2002). The average dissolved aluminum concentration for all records is 335 µg/L. The minimum and maximum concentrations are 0.6 µg/L, and 2,720 µg/L. Of the 17 sites with dissolved aluminum records, only 2 sites (10532-Mud Creek at US 84 and 10627-Angelina River at US 59) had any records exceeding the TWQS of 991 µg/L for dissolved aluminum. Table 5A-14 summarizes the dissolved aluminum records for segment 0611.

There are 31 records available for dissolved aluminum concentrations measured in the surface waters (0.3 m) of segment 0612 and its subsegments (period of record: December 1984 to July 2002). The average dissolved aluminum concentration for all records is 404 µg/L. The minimum and maximum concentrations are 2.9 µg/L, and 3,800 µg/L. Of the 7 sites with dissolved aluminum records, only station 10636 (Attoyac Bayou at SH 21) showed any exceedances of the TWQS of 991 µg/L for dissolved aluminum. These exceedances occurred on October 14, 1986 (3,800 µg/L); August 7, 1989 (1,080 µg/L); and June 25, 1991 (3,560 µg/L). Table 5A-15 summarizes the dissolved aluminum records for segment 0612.

Twenty aluminum concentration records are available for bottom sediments, measured at 10 sites with a period of record from December 16, 1997 to May 10, 2000, for segment 0611 and its subsegments. Summary statistics are as follows for the 20 samples: average, 2,941.3 mg/kg; minimum, 0.25 mg/kg; maximum, 21,400 mg/kg. No samples exceed a PEC of 58,030 mg/kg (USEPA 1996).

Eight aluminum concentration records are available for bottom sediments, measured at six sites with a period of record from November 5, 1997, to March 18, 2000, for segment 0612 and its subsegments. Summary statistics are as follows for the eight samples: average, 5,585.1 mg/kg; minimum 0.17 mg/kg; maximum, 20,100 mg/kg. There were no exceedances of a PEC of 58,030 mg/kg (USEPA 1996).

Arsenic

There are 58 records available for dissolved arsenic in surface waters of segment 0611 and its subsegments (period of record: October 1993 to April 2002). Twenty-six records (period of record: January1994 to March 2002) are available for dissolved arsenic in the surface waters of segment 0612 and its subsegments. No exceedances of the acute or chronic TSWQS (390 µg/L and 190 µg/L) were observed. Table 5A-16 summarizes the dissolved arsenic concentrations observed in segments 0611 and 0612.

June 2003 5-19 Historical Data Review for Sam Rayburn Reservoir

Copper

There are 82 records available for dissolved copper in surface waters for segment 0611 and its subsegments, with a period of record from October 1993 to July 2002. Table 5 in the Procedures to Implement the TSWQS Guidance (TCEQ 2000) provides a 15th percentile hardness value for segment 0611 of 30 mg/L as CaCO3. Copper criteria calculated using this value for segment 0611 are 4.4 µg/L (chronic) and 5.9 µg/L (acute). Of the 82 available dissolved copper records, 42 exceed the calculated chronic and acute criteria. However, 30 of the 42 samples that exceeded both the chronic and acute criteria were nondetects with detection limits of 6 µg/L or 10 µg/L. Table 5A-17 includes the detection records for segment 0611 that exceed the calculated chronic and acute criteria for dissolved copper. Table 5A-18 summarizes the available dissolved copper data for segment 0611.

There are 29 records available for dissolved copper in surface waters for segment 0612, with a period of record from January 1994 to July 2002. Table 5 in the Procedures to Implement the TSWQS Guidance (TCEQ 2000) provides a 15th percentile hardness value for segment 0612 of 28 mg/L as CaCO3. Copper criteria calculated using this value for segment 0612 are 4.1 µg/L (chronic) and 5.6 µg/L (acute). When the 29 records were screened using the calculated criteria, 19 exceedances of the chronic criterion were revealed. Of these, 18 also exceeded the acute criterion. However, 18 of the 19 samples that exceeded the chronic criterion were nondetects with detection limits of 6 µg/L or 10 µg/L, and all records exceeding the acute criterion were based on nondetects. One sample from station 16076 on March 7, 2001 (5 µg/L) exceeded the chronic criterion of 4.1 µg/L. Table 5A-19 summarizes the available dissolved copper data for segment 0612.

Lead

There are 80 records available for dissolved lead in surface waters for segment 0611, with a period of record from October 1993 to July 2002. Using the 15th percentile hardness value (30 mg/L as CaCO3), the calculated chronic criterion for lead for segment 0611 is 0.54 µg/L and the acute criterion is 15.7 µg/L. When the 80 records were screened using the calculated criteria, 77 records exceeded the chronic criterion. However, of the 77 samples that exceeded the chronic criterion, some were reported as nondetects with detection limits of 1 µg/L, 2 µg/L, or 100 µg/L. Fifteen samples from station 10627 were reported as nondetects with a detection limit of 100 µg/L, exceeding the acute criterion of 15.7 µg/L. The remaining four detected concentrations that exceeded the chronic criterion are included in Table 5A-20. Table 5A-21 summarizes dissolved lead concentrations that exceeded the calculated chronic criteria for segment 0611.

There are 32 records available for dissolved lead in surface waters for segment 0612 (period of record from January 1994 to July 2002). Table 5 in Procedures to Implement the TSWQS Guidance (TCEQ 2000) provides a calculated 15th percentile hardness value for segment 0612 of th 28 mg/L as CaCO3. Using the 15 percentile hardness value, the chronic criterion for lead for segment 0612 is 0.5 µg/L and the acute criterion is 14.4 µg/L. Of the 32 records, 31 records exceeded the chronic criterion and 15 exceeded the acute criterion. However, 29 of these exceedances were nondetects with detection limits of 1 µg/L, 2µg/L, or 100 µg/L. The remaining two detections are presented in Table 5A-20. Table 5A-21 summarizes the available dissolved lead data for segment 0612.

June 2003 5-20 Historical Data Review for Sam Rayburn Reservoir

Selenium

There are 84 records available for total selenium for segment 0611 (period of record from June 1975 to March 2002). Four exceedances of the chronic criterion (5 µg/L) were observed, one of which also exceeded the acute criterion (20 µg/L). However, these exceedances are based on records reported as nondetects with reporting limits of 20 µg/L or 25 µg/L. Table 5A-22 summarizes the available total selenium data for segment 0611.

There are 17 records available for total selenium for segment 0612 and its subsegments (period of record from July 1974 to March 2002). All 17 records are reported as nondetects. Therefore, there were no exceedances of the total selenium criteria. However, the detection limits for four records exceeded the chronic and acute criteria of 5 µg/L and 20 µg/L. Table 5A-23 summarizes the available total selenium data for segment 0612.

Zinc

There are 82 records available for dissolved zinc for segment 0611 and its subsegments (period of record from October 1993 to July 2002). Using the 15th percentile hardness value (30 mg/L as

CaCO3), the calculated chronic criterion for zinc for segment 0611 is 37.7 µg/L, and the acute criterion is calculated to be 41.3 µg/L. Of the 82 records, there were 10 exceedances of the chronic and acute criteria. These exceedances are presented in Table 5A-24. Table 5A-25 summarizes the available dissolved zinc data for segment 0611.

There are 32 records available for dissolved zinc in surface waters for segment 0612 and its subsegments (period of record from January 1994 to July 2002). Using the 15th percentile hardness value (28 mg/L as CaCO3), the chronic criterion for zinc for segment 0611 is 35.5 µg/L and the acute criterion is calculated to be 38.9 µg/L. Of the 32 records, one exceeded the chronic and acute criteria. This exceedance occurred at station 10636 on May 1, 2001, with a dissolved zinc concentration of 41 µg/L and sample-specific hardness of 58 mg/L as CaCO3. Table 5A-26 summarizes the available dissolved zinc data for segment 0612.

Dioxin

No data were located in TRACS for the identified STORET codes for dioxin or dioxin-like compounds in water, sediment, or tissues.

5.2.2.3 Bacteria

Segment 0611: Fecal Coliform Bacteria

There are 339 records available for fecal coliform bacteria in surface waters for segment 0611 and its subsegments (period of record from January 1990 to November 2002). The data range from 1 count/100 mL to 15,000 counts/100 mL. There were 59 exceedances of the instantaneous criterion of 400 counts/100 mL. The data are presented in Table 5A-27.

June 2003 5-21 Historical Data Review for Sam Rayburn Reservoir

Segment 0612: Fecal Coliform Bacteria

There are 74 records available for fecal coliform bacteria in surface waters for segment 0612 and its subsegments, with a period of record from June 1990 to August 2002. The data range from 1 count/100 mL to 2,300 counts/100 mL. There were 16 exceedances of the 400 counts/100 mL instantaneous criterion. The data are presented in Table 5A-27.

Segment 0611: Escherichia coli

There are 103 records available for E. coli in surface waters for segment 0611 and its subsegments (period of record from October 2000 to November 2002). The data range from 14.8 MPN/100mL to 3,970 MPN/100mL. There were 16 exceedances of the 394 MPN/100mL instantaneous criterion. The data are presented in Table 5A-28.

Segment 0612: Escherichia coli

There are 17 records available for E. coli in surface waters for segment 0612 and its subsegments (period of record from November 2000 to August 2002). The data range from 32.4 MPN/100 mL to 1,373 MPN/100 mL. There were 5 exceedances of the 394 MPN/100 mL instantaneous criterion. The data are presented in Table 5A-28.

5.2.2.4 Conventional Parameters

Segment 0611: Alkalinity

There are 106 records available for alkalinity in surface waters for segment 0611 and its subsegments, with a period of record from October 1993 to November 2002. The data range from 4.0 mg/L to 130 mg/L. There are no water quality criteria for alkalinity. The data are presented in Table 5A-29.

Segment 0612: Alkalinity

There are 32 records available for alkalinity in surface waters for segment 0612 and its subsegments (period of record from June 1990 to August 2002). The data range from 5.0 mg/L to 69 mg/L. There are no water quality criteria for alkalinity. The data are presented in Table 5A-29.

Segment 0611: Chloride

There are 360 records available for chloride in surface waters for segment 0611 and its subsegments (a period of record from January 1990 to November 2002). The data range from 2.6 mg/L to 474.9 mg/L. There were eight exceedances of the 125 mg/L criterion. The data are presented in Table 5A-30.

June 2003 5-22 Historical Data Review for Sam Rayburn Reservoir

Segment 0612: Chloride

There are 109 records available for chloride in surface waters for segment 0612 and its subsegments (period of record from June 1990 to August 2002). The data range from 3 mg/L to 84.4 mg/L. There was one exceedance of the 75 mg/L criterion. The data are presented in Table 5A-30.

Segment 0611: Sulfate

There are 360 records available for sulfate in surface waters for segment 0611 and its subsegments (period of record from January 1990 to November 2002). The data range from 0.3 mg/L to 3272 mg/L. There were 16 exceedances of the 50 mg/L criterion. The data are presented in Table 5A-31.

Segment 0612: Sulfate

There are 110 records available for sulfate in surface waters for segment 0612 and its subsegments (period of record from June 1990 to August 2002). The data range from 0.1 mg/L to 444 mg/L. There were two exceedances of the 50 mg/L criterion. The data are presented in Table 5A-31.

Segment 0611: Total Suspended Solids

There are 421 records available for TSS in surface waters for segment 0611 and its subsegments (period of record from October 1994 to November 2002). The data range from 1.0 to 198 mg/L. There are no water quality criteria for TSS. The data are presented in Table 5A-32.

Segment 0612: Total Suspended Solids

There are 110 records available for TSS in surface waters for segment 0612 and its subsegments (period of record from June 1990 to July 2002). The data range from 2 to 100 mg/L. There are no water quality criteria for TSS. The data are presented in Table 5A-32.

Segment 0611: Total Dissolved Solids

There are 284 records available for TDS in surface waters for segment 0611 and its subsegments (period of record from August 1993 to November 2002). The data range from 9 to 606 mg/L. There were 87 exceedances of the TDS criterion. The data are presented in Table 5A-33.

Segment 0612: Total Dissolved Solids

There are 68 records available for TDS in surface waters for segment 0611 and its subsegments (period of record from August 1994 to August 2002). The data range from 54 to 10,100 mg/L. There were 67 exceedances of the TDS criterion. The data are presented in Table 5A-33.

June 2003 5-23 Historical Data Review for Sam Rayburn Reservoir

Segment 0611: Water Temperature

There are 456 records available for temperature in surface waters for segment 0611 and its subsegments (period of record from January 1990 to November 2002). The data range from 2.7 °C to 32 °C. There were no exceedances of the 32.2 °C criterion. The data are presented in Table 5A-34.

Segment 0612: Water Temperature

There are 110 records available for temperature in surface waters for segment 0612 and its subsegments (period of record from June 1990 to July 2002). The data range from 2.2 °C to 29 ° C. There were no exceedances of the 32.2 °C criterion. The data are presented in Table 5A-34.

Segment 0611: pH

There are 507 records available for pH in surface waters for segment 0611 and its subsegments (period of record from January 1990 to November 2002). The data range from 4.8 to 8.5. There were 20 exceedances of the 6.0 to 8.5 criterion. The data are presented in Table 5A-35.

Segment 0612: pH

There are 118 records available for pH in surface waters for segment 0612 and its subsegments (period of record from June 1990 to July 2002). The data range from 5.7 to 8.9. There were 14 exceedances of the 6.0 to 8.5 criterion. The data are presented in Table 5A-35.

Segment 0611: Conductivity

There are 415 records available for specific conductance in surface waters for segment 0611 and its subsegments (period of record from January 1990 to November 2002). The data range from 21 µmos/cm to 738 µmos/cm. There are no water quality criteria for conductivity. The data are presented in Table 5A-36.

Segment 0612: Conductivity

There are 75 records available for specific conductance in surface waters for segment 0612 and its subsegments (period of record from June 1990 to July 2002). The data range from 35 µmos/cm to 1,110 µmos/cm. There are no water quality criteria for conductivity. The data are presented in Table 5A-36.

5.2.3 Impairment Summary

This section provides a summary of the TRACS data that exceeded the Texas water quality criteria, Texas nutrient screening levels, and/or EPA nutrient reference criteria for any of the analyzed parameters. The following sections provide a more detailed account of the number of observations, minimum observation, maximum observation, average, and number of exceedances of the applicable criteria or target for each of the parameters.

June 2003 5-24 Historical Data Review for Sam Rayburn Reservoir

Dissolved Oxygen and Nutrients

There were 436 available grab samples for dissolved oxygen in segment 0611 and only 3 records ranging from 1.3-2.8 mg/L exceeded the minimum criterion. Of the available 24-hour measurements, 3 records exceeded the average criterion. One of these also exceeded the minimum criteria (station 16587). No exceedances of the dissolved oxygen average or minimum criteria were observed within segment 0612 for both grab samples and 24-hour measurements. While DO appears to experience occasional exceedances of the criteria, these exceedances do not appear to be persistent.

Nutrient data were compared to TCEQ’s nutrient screening levels and EPA’s nutrient reference criteria. For some parameters, there are large differences in the screening values, for example, chlorphyll a concentrations for TCEQs screening levels are about 19 times higher than EPA’s reference values. Only two chlorophyll a samples were higher than the Texas screening levels in segment 0611 and none were observed in segment 0612. When the data were compared to the EPA reference levels, 136 chlorophyll a concentrations in segments 0611 and 0612 exceeded the reference values.

For the remaining nutrient parameters, there were high observations of total phosphorus, orthophosphorus, nitrite and nitrate, and ammonia in segments 0611 and 0612 that exceeded both the TCEQ and EPA reference screening values.

Nutrient data for segments 0611 and 0612 were compared to EPA’s nutrient reference criteria for streams and rivers. This comparison found high observations of chlorophyll a, total phosphorus, total nitrogen, nitrite and nitrate, and total kjeldahl nitrogen.

Much of the nutrient data suggests loading, either from point or nonpoint sources, of nitrogen and phosphorus that may affect algal growth and subsequent DO dynamics in the tributaries as well as in Sam Rayburn Reservoir. Chlorophyll a in flowing systems such as those represented by segments 0611 and 0612 may underestimate actual algal production, which may be due to periphytic (attached algae) growth rather than pelagic (floating algae) algal growth (assuming that the chlorphyll a samples for these segments are from a filtered water sample). Similar to the data for segments 0610 and 0615, nutrient data suggests that the mechanisms are in place for eutrophication of the reservoir. Tributary data further reinforces this observation.

Assessments of whether or not loading is predominant from one arm (Attoyac Bayou segment 0612) versus the other (Angelina River segment 0611) are difficult to make for nutrients. A number of sample locations are present in both tributaries and only through the conduct of a proper loading analysis would one be able to discern where loads may be originating from in the watershed.

Metals

Dissolved aluminum, dissolved copper, dissolved lead, dissolved zinc, and total selenium all had data that exceeded the Texas water quality criteria specific to those metals. The dissolved aluminum exceedances were small in number (4 and 3 exceedances at segments 0611 and 0612, respectively). These exceedances occured at stations 10532 and 10627 in segment 0611 and

June 2003 5-25 Historical Data Review for Sam Rayburn Reservoir station 10636 in segment 0612. Some copper, lead, and selenium observations did exceed their criteria, but most of the samples were below the detection limit, so it was difficult to get an accurate assessment of the potential impairment. Twelve dissolved copper exceedances were observed at 11 stations in segment 0611. Eight of these exceedances were in the Mud Creek and West Mud Creek subsegments (0611C and 0611D) in the northwestern portion of the watershed below the City of Tyler. In segment 0612 only one sample from station 16076 on March 7, 2001 (5 µg/L) exceeded the dissolved copper criterion. Four dissolved lead exceedances were observed at 4 stations in segment 0611, whereas only 2 exccedances were observed at station 10636 on segment 0612. All exceedances of the total selenium criterion in segment 0611 and 0612 were based on nondetects. There were 10 dissolved zinc exceedances in segment 0611 and one exceedance in segment 0612. Similar to segments 0610 and 0615, metal concentrations in the reservoir tributaries are generally low and a number of the exceedances are based on detection limits that are greater than the criteria. Sampling and analyses of metals using lower detection limits will clarify whether or not potential metals issues exist in these tributaries.

Bacteria

Bacteria is a potential impairment on segments 0611 and 0612. There were 59 exceedances of the instantaneous fecal coliform bacteria criterion on segment 0611(17 percent of the samples). With maximum counts ranging from 180 to 15,000 counts/100 mL. Of these 59 exceedances, 23 are reproted from La Nana Bayou downstream of the city of Nacogdoches. There were 16 exceedances of the criterion on segment 0612 (22 percent of the samples), with maximum counts ranging from 130 to 2,300 counts/100 mL. There were also 16 exceedances of the instaneous E. coli criterion on segment 0611 (16 percent of samples) and 5 exceedances of the criterion on segment 0612 (29 percent of samples), with maximum counts of 122 to 3,970 counts/100 mL and 461to 1,373 counts/100 mL. Nine of the 16 exceedances in segment 0611 were from the La Nana Bayou stations 10474 and 10475, downstream of Nacogdoches.

Chloride and Sulfate

There were exceedances of both the chloride and sulfate criteria for segments 0611 and 0612. However, the percentage of observations exceeding the criteria was less than five percent.

TDS and pH

There were also several TDS and pH exceedances on segments 0611 and 0612 with more occurring for both parameters in segment 0612 than in 0611.

June 2003 5-26 Historical Data Review for Sam Rayburn Reservoir

5.3 STORET Water Quality Data for Segments 0611 and 0612

Water quality monitoring data for the tributaries to Sam Rayburn Reservoir were collected from EPA’s STORET database for the two segments composing the upstream portion of the Sam Rayburn Reservoir watershed (segments 0611 and 0612). This section is a summary and analysis of all of the water quality monitoring data available in EPA’s STORET database from 1990 through the present for the tributaries to the Sam Rayburn Reservoir. The summarized data include only data collected from 1990 through the present even though additional data for years prior to 1990 are available for many of the monitoring stations. The more recent data will better represent the current conditions that caused Sam Rayburn Reservoir and some of its tributaries to be placed on the 2000 Texas section 303(d) list of impaired waters.

Because Sam Rayburn Reservoir was placed on the 2000 Texas section 303(d) list of impaired waterbodies for dissolved oxygen, pH, and aluminum impairments, these three parameters were analyzed in the tributaries draining to the reservoir. Several of those tributaries are also on the 2000 Texas section 303(d) list for bacteria (see Section 1.2), and therefore any parameters that affect dissolved oxygen (i.e., nutrients, transparency, and chlorophyll a) and bacteria were included in the analysis. At the request of TCEQ, additional parameters were also included in the analysis to determine whether there are additional potential impairments. For parameters that have water quality criteria or screening levels, the number of exceedances was determined for each station. Section 1.3 discusses the appropriate water quality criteria and screening levels. All stations were analyzed for the following parameters:

• Temperature • Transparency nitrite nitrogen • Biochemical • pH • Total organic • Chlorophyll oxygen demand • Ammonia carbon • Dissolved • Dissolved solids • Phosphorus • Sulfate arsenic • Total nitrogen • Chloride • Dissolved lead • Selenium • Fecal coliform • Dissolved copper • Dissolved bacteria • Conductivity oxygen • Dissolved • Total alkalinity • Total solids aluminum • Nitrate and • Total Kjeldahl • Dissolved zinc

5.3.1 STORET Monitoring Stations for the Tributaries to the Sam Rayburn Reservoir

There are 83 monitoring stations in the STORET database with water quality data from Sam Rayburn Reservoir’s tributaries; however, only 11 stations have post-1989 data. The 11 stations with recent data were the only stations analyzed for water quality trends in the watershed. There were nine monitoring stations on segment 0611 (including the Angelina River (0611), East Fork Angelina River (0611A), Mud Creek (0611C), and West Mud Creek (0611D)) and two on segment 0612 (Attoyac Bayou). Table 5-5 presents the stations in the tributaries to the Sam Rayburn Reservoir with post-1989 water quality data. Figure 5-10 shows the locations of the stations in the watershed.

June 2003 5-27 Historical Data Review for Sam Rayburn Reservoir

Table 5-5. Water Quality Monitoring Stations with Data since 1990 on the Tributaries to Sam Rayburn Reservoir Segment ID Station ID Station Name

08037000 Angelina River near Lufkin

06110100 Angelina River at US 59 north of L 0611 (Angelina River) 10633 Angelina River at SH 204

14470 Angelina River at US 84

0611A (East Fork Angelina 10551 East Fork Angelina River River) 13788 East Fork Angelina River

10532 Mud Creek at US 84 0611C (Mud Creek) 14477 Mud Creek at US 79

0611D (West Mud Creek) 10540 West Mud Creek at FM 346

06120100 Attoyac Bayou at SH 21 E 0612 (Attoyac Bayou) 08038000 Attoyac Bayou near Chiren

June 2003 5-28 Historical Data Review for Sam Rayburn Reservoir

10540 S#

14477 S# 14470

10532 S# S# S# 10551 # S10633 S# 13788

08038000 S# 06110100 06120100 S# 08037000

S# Attoyac Bayou Water Quality Stations S# East Fork Angelina River Water Quality Stations S# Mud Creek Water Quality Stations S# Angelina River Water Quality Stations Reach File, Version 1 Sam Rayburn Reservoir watershed

N 0 20 40 Miles W E

Sources: S EPA's BASINS EPA's STORET

Figure 5-10. Locations of the STORET Water Quality Monitoring Stations on the Tributaries to Sam Rayburn Reservoir

June 2003 5-29 Historical Data Review for Sam Rayburn Reservoir

5.3.2 Water Quality Data Analysis for Segment 0611 and 0612

5.3.2.1 Dissolved Oxygen and Nutrients

Segment 0611: Dissolved Oxygen

There are 9 monitoring stations on segment 0611 with a total of 84 dissolved oxygen observations. The lowest dissolved oxygen observation was 4.7 mg/L at station 14470 (Angelina River) on June 12, 1996. The maximum dissolved oxygen observation was 12.4 mg/L at station 14477 (Mud Creek) on January 9, 1996. There were no exceedances of the 3.0 mg/L criterion for dissolved oxygen grab samples. Table 5B-1 presents a summary of the dissolved oxygen data for segment 0611. Tables 5B-1 through 5B-36 are presented in Appendix 5B at the end of Section 5.0 because of their large size.

Segment 0612: Dissolved Oxygen

There are 2 monitoring stations on segment 0612 with a total of 26 dissolved oxygen observations. The lowest dissolved oxygen observation was 6.1 mg/L at station 06120100 on June 13, 1990, and June 25, 1991; therefore, there were no exceedances of the 3.0 mg/L dissolved oxygen criterion. The maximum dissolved oxygen observation was 11.6 mg/L at station 08038000 on February 9, 1995. Table 5B-2 presents a summary of the dissolved oxygen data available for segment 0612.

Segment 0611: Chlorophyll a

There are 4 stations on segment 0611 with 29 chlorophyll a observations. The minimum observation was 1.0 µg/L at several stations on multiple dates. The maximum observation was 17.7 µg/L at station 14470 on October 31, 1995. This was the only observation that was higher than the chlorophyll a screening level of 11.6 µg/L for freshwater Texas streams; however, 13 observations were higher than the EPA reference criterion for chlorophyll a of 0.566 µg/L. Table 5B-3 presents a summary of the available chlorophyll a data for segment 0611.

Segment 0612: Chlorophyll a

There is one station on segment 0612 with chlorophyll a data. Station 06120100 has three observations of chlorophyll a with a minimum concentration, 1.0 µg/L, on June 25, 1991, and a maximum concentration, 10.2 µg/L, on July 15, 1992. There were no observations higher than the 11.4 µg/L screening level for chlorophyll a in freshwater Texas streams, but there was one observation higher than the 2.834 mg/L chlorophyll a EPA reference criterion. The high observation occurred on July 15, 1992. Table 5B-4 presents a summary of the available chlorophyll a data for segment 0612.

June 2003 5-30 Historical Data Review for Sam Rayburn Reservoir

Segment 0611: Transparency

Transparency was measured as Secchi disc depth in segment 0611. There are 6 monitoring stations with a total of 33 Secchi depth observations in segment 0611. The number of observations at each station ranges from 1 to 13. The minimum Secchi depth was 0.15 meter at station 10532 on May 21, 1998. The maximum Secchi depth of 0.9 meter was observed at station 13788 on both December 27, 1993, and November 6, 1996. There are no transparency criteria for Texas freshwater streams to which the data can be compared. Table 5B-5 presents the Secchi depth data summary for segment 0611.

Segment 0612: Transparency

Transparency was also measured as Secchi disc depth in segment 0612. There is one monitoring station with a total of three Secchi depth observations in segment 0612. Station 06120100 had a minimum Secchi depth of 0.18 meter on June 25, 1991. The maximum Secchi depth, 0.5 meter was observed on July 15, 1992. There are no transparency criteria for Texas freshwater streams to which the data can be compared. Table 5B-6 presents the Secchi depth data summary for segment 0612.

Segment 0611: Total Phosphorus

There are 4 stations with 28 total phosphorus observations on segment 0611. The minimum observation was 0.01 mg/L at station 13788 (East Fork Angelina River) on December 27, 1993. The maximum observation was 0.53 mg/L at station 14477 (Mud Creek) on October 16, 1995. There were no observations above the 0.8 mg/L screening level for Texas freshwater streams; however, there were 21 observations above the 0.05 mg/L EPA reference criterion. Table 5B-7 presents a summary of the total phosphorus data available for segment 0611.

Segment 0612: Total Phosphorus

There is only one monitoring station (06120100) with three total phosphorus observations on segment 0612. The minimum observations was 0.08 mg/L on July 15, 1992, and the maximum was 0.15 mg/L on June 25, 1991. No observations were higher than the 0.8 mg/L screening level for Texas freshwater streams; however, all three observations were higher than the 0.05 mg/L EPA reference criterion. Table 5B-8 presents a summary of the total phosphorus data available for segment 0612.

Segment 0611: Orthophosphorus

There are five monitoring stations on segment 0611 with a total of 10 orthophosphorus observations. Five of the observations are above the 0.5 mg/L screening level for orthophosphorus in Texas freshwater streams. The minimum observation was 0.1 mg/L at station 14470 on the Angelina River in both April and June 1996. The maximum observation was 2.2 mg/L at station 10540 on West Mud Creek on May 21, 1998. The three stations with high concentrations of orthophosphorus are 10633 (Angelina River), 10532 (Mud Creek), and 10540 (West Mud Creek). Table 5B-9 presents a summary of the ortho-phosphorus data available for segment 0611.

June 2003 5-31 Historical Data Review for Sam Rayburn Reservoir

Segment 0612: Orthophosphorus

There are no monitoring stations with orthophosphorus data on segment 0612 in the STORET database.

Segments 0611 and 0612: Total Nitrogen

There were no monitoring stations on segments 0611 and 0612 with NH4, TKN, and NO2+NO3 observations on the same dates. Ammonia, TKN, and NO2+NO3 data are necessary to calculate total nitrogen in the waterbodies.

Segment 0611: Nitrite and Nitrate

There were 7 water quality monitoring stations on segment 0611 with a total of 19 NO2+NO3 observations. The minimum observation was 0.01 mg/L at station 14470 in the Angelina River on October 28, 1996. The maximum observation was 10.40 mg/L at station 10540 in West Mud Creek on May 21, 1998. Three observations were higher than the Texas screening level for

NO2+NO3 (2.76 mg/L), and all three elevated concentrations were inn West Mud Creek. Eighteen of the 19 samples were higher than the 0.067 mg/L EPA reference criterion for streams.

Table 5B-10 presents a summary of the NO2+NO3 data for segment 0611.

Segment 0612: Nitrite and Nitrate

Segment 0612 contains one monitoring station with NO2+NO3 observations. There are two observations at this station. The minimum observation, 0.53 mg/L, was observed on June 25, 1991, and the maximum observation, 0.72 mg/L, was observed on July 15, 1992. There were no observations higher than the Texas screening level of 2.76 mg/L for NO2+NO3 in freshwater streams; however, both observations were higher than the EPA reference criterion of 0.067 mg/L for NO2+NO3. Table 5B-11 presents a summary of the NO2+NO3 data for segment 0612.

Segment 0611: Total Kjeldahl Nitrogen

There are four monitoring stations with a total of 17 TKN observations on segment 0611. The minimum TKN observation was 0.28 mg/L at stations 14470 (Angelina River) and 13788 (East Fork Angelina River) on the dates of 12/27/93, 5/26/94, and 4/10/96. The maximum TKN concentration was 0.88 mg/L at station 14477 on Mud Creek on April 10, 1996. Five observatiosn were higher than EPA’s reference criterion of 0.44 mg/L for TKN. Table 5B-12 presents a summary of the TKN data available for segment 0611.

Segment 0612: Total Kjeldahl Nitrogen

There are no TKN data available in the STORET database for segment 0612.

June 2003 5-32 Historical Data Review for Sam Rayburn Reservoir

Segment 0611: Ammonia

There are nine monitoring stations on segment 0611 with ammonia (un-ionized NH3) observations. There are a total of 50 observations at those stations. The minimum observation of 0.000004 mg/L was observed at station 06110100 on November 6, 1991. The maximum observation of 0.0009 mg/L was observed at station 10540 on May 21, 1998. None of the ammonia observations were higher than the Texas screening level of 0.17 mg/L for ammonia. Table 5B-13 presents a summary of the ammonia data for segment 0611.

Segment 0612: Ammonia

There are 2 stations (06120100 and 08038000) on segment 0612 with a total of 23 un-ionized ammonia observations. The minimum ammonia observation was 0.00001 mg/L at station 08038000 on April 20, 1995. The maximum observation was 0.001 mg/L at station 06120100 on July 15, 1992. None of the ammonia observations were higher than the Texas screening level of 0.17 mg/L. Table 5B-14 presents a summary of total ammonia data available for segment 0612.

Segment 0611: Biochemical Oxygen Demand

There is one monitoring station that has BOD5 data n segment 0611. Monitoring station 08037000 has 20 observations from January 27, 1994, through March 27, 1997. The lowest

BOD5 observation was 0.6 mg/L on June 30, 1995. The maximum BOD5 observation was 2.4 mg/L on June 9, 1994, and February 13, 1997. There are no BOD5 water quality criteria to which the data can be compared. Table 5B-15 presents a summary of the available BOD5 data for segment 0611.

Segment 0612: Biochemical Oxygen Demand

There is one monitoring station that has BOD5 observations on segment 0612. Monitoring station 08038000 has 20 observations from January 27, 1994, through March 27, 1997. The lowest

BOD5 observation was 0.5 mg/L on July 29, 1994. The maximum BOD5 observation was 2.3 mg/L on February 15, 1996. There are no BOD5 water quality criteria to which the data can be compared. Table 5B-16 presents a summary of the BOD5 data for segment 0612.

Segment 0611: Total Organic Carbon

There are five monitoring stations and 48 TOC observations on segment 0611. The minimum TOC observation was 2.0 mg/L at station 13788 (East Fork Angelina River) on December 27, 1993. The maximum TOC observation, 19.0 mg/L, was at station 08037000 on the Angelina River on February 13, 1997. There are no TOC criteria to which the water quality data can be compared. Table 5B-17 presents a summary of the available TOC data for segment 0611.

Segment 0612: Total Organic Carbon

Segment 0612 has 2 monitoring stations with a total of 21 TOC observations. The minimum observation was 3.0 mg/L at station 06120100 on July 15, 1992. The maximum observation was 11.0 mg/L at station 08038000 on January 27, 1994, and April 26, 1996. There are no Texas

June 2003 5-33 Historical Data Review for Sam Rayburn Reservoir

TOC criteria to which the water quality data can be compared. Table 5B-18 presents a summary of the available TOC data for segment 0612.

5.3.2.2 Metals and Dioxin

Segment 0611: Metals

Six metals were analyzed for segment 0611: dissolved arsenic, dissolved aluminum, dissolved copper, dissolved lead, total selenium, and dissolved zinc. The metals observations were compared to the appropriate water quality criteria. (See Section 1.3.)

Two monitoring stations on segment 0611 have dissolved arsenic data. There are 11 observations at these stations. The minimum observation, 1.0 µg/L, was observed on most days at station 08037000, except for 2 days that had observations of 2.0 µg/L. Both of these concentrations are well below the 360 µg/L and 50 µg/L aquatic life and human health water quality criteria, respectively. There was one dissolved arsenic observation at station 13788 with a concentration of 2.0 µg/L as well.

There is one monitoring station (06110100) with seven dissolved aluminum observations on segment 0611. The minimum observation was 310 µg/L on January 15, 1990. The maximum observation was 2,410 µg/L on August 8, 1990. The observations were compared to the acute dissolved aluminum criterion of 991 µg/L, which resulted in three exceedances of the criterion in August and October 1990 and April 1991.

There are two monitoring stations with dissolved copper data for segment 0611. Station 08037000 has 10 observations and station 13788 has one observation. All observations at station 08037000 were recorded as 10 µg/L, which was the detection limit. The 10 µg/L detection limit is higher than the calculated dissolved copper acute criterion of 5.9 µg/L and the chronic criterion of 4.4 µg/L. Therefore, it could not be determined if the waterbody is actually exceeding the dissolved copper criteria. The maximum dissolved copper observation is 11.0 µg/L at station 13788, which exceeds the calculated acute criterion of 5.9 µg/L.

Segment 0611 has 2 monitoring stations with dissolved lead data. Station 13788 has one observation and station 08037000 has 10 observations. The minimum dissolved lead observation was 1.0 µg/L at station 13788 on October 26, 1993. The maximum observation was 20.0 µg/L at station 08037000 on August 31, 1995. There is one exceedance of the aquatic life acute criterion of 15.7 µg/L in August 1995 at station 08037000. There were also 4 exceedances of the 4.98 µg/L human health criterion at station 08037000. Six of the observations were below the detection limit of 10 µg/L. The nondetect samples were not considered to be exceeding the criteria, although, that possibility does exist because the detection limit is above both the chronic criterion and human health criterion.

There is only one observation of total selenium on segment 0611. The observation was 5 µg/L at station 106333 on August 28, 1997. The 5 µg/L concentration does not exceed the total selenium acute aquatic life or human health criteria of 20 µg/L and 50 µg/L, respectively.

Segment 0611 has 2 monitoring stations with a total of 11 dissolved zinc observations. Station

June 2003 5-34 Historical Data Review for Sam Rayburn Reservoir

13788 on the East Fork Angelina River has 1 day of data and station 08037000 on the Angelina River has 10 days of data. The minimum concentration of dissolved zinc (1.0 µg/L) was observed in August 1995 and February 1996 at station 08037000. The maximum observation was 48.0 µg/L at station 13788 in October 1993. This maximum concentration was the only observed exceedance of the calculated 41.3 µg/L dissolved zinc acute aquatic life criterion. There were no exceedances of the 37.7 µg/L chronic criterion. Table 5B-19 presents a summary of the available metals data for segment 0611.

Segment 0612: Metals

Six metals were analyzed for segment 0612: dissolved arsenic, dissolved aluminum, dissolved copper, dissolved lead, total selenium, and dissolved zinc. The metals observations were compared to the appropriate water quality criteria. (See Section 1.3.)

There is 1 monitoring station (08038000) with 10 dissolved arsenic observations on segment 0612. All 10 observations were 1.0 µg/L. There were no exceedances of the acute aquatic life, chronic aquatic life, or human health arsenic water quality criteria of 360 µg/L, 190 µg/L, and 50 µg/L, respectively.

There is one monitoring station with one dissolved aluminum observation on segment 0612. Station 06120100 reports a concentration of 3,560 µg/L on June 25, 1991, which exceeds the Texas aquatic life acute water quality criterion of 991 µg/L for dissolved aluminum.

Station 08038000 is the only station with dissolved copper data in segment 0612. There are a total of 10 observations at the station, and all observations are nondetects. The detection limit is 10 µg/L and is not considered to be exceeding the water quality criteria because the actual value of the sample is not known. The detection limit should be decreased for future sampling to allow for comparison of the data to the acute water quality criterion of 5.6 µg/L and the chronic water quality criterion of 4.4 µg/L.

Station 08038000 is the only station with dissolved lead data on segment 0612. It has 10 days of observation data. All observations were below the detection limit of 10 µg/L, and therefore, there were no exceedances of the calculated acute water quality criterion of 14.4 µg/L. The detection limit should be decreased for future sampling to allow for comparison of the data to the chronic criterion of 0.5 µg/L and the 4.98 µg/L human health criterion.

No total selenium data were available for segment 0612.

Station 08038000 has 10 observations of dissolved zinc on segment 0612. The minimum observation was 3 µg/L on August 29, 1995, and the maximum observation was 20 µg/L on August 25, 1994. There were no exceedances of the calculated acute and chronic water quality criteria of 38.9 µg/L and 35.5 µg/L, respectively.

Table 5B-20 presents a summary of the metals data for segment 0612.

June 2003 5-35 Historical Data Review for Sam Rayburn Reservoir

Dioxin

There were no dioxin data for segment 0611 or 0612 in the STORET database.

5.3.2.3 Bacteria

Segment 0611: Fecal Coliform Bacteria

Segment 0611 has 8 monitoring stations with a total of 69 fecal coliform bacteria observations. The minimum fecal coliform bacteria observation was 10 counts/100 mL at station 06110100 (Angelina River) on January 5, 1990. The maximum fecal coliform bacteria concentration was 8,100 counts/100 mL at station 10532 (Mud Creek) on November 26, 1996. There was a total of 16 exceedances of the 400 counts/100 mL instantaneous criterion. Table 5B-21 presents a summary of the available fecal coliform bacteria data for segment 0611.

Segment 0612: Fecal Coliform Bacteria

There is only one station (06120100) with 8 fecal coliform bacteria observations on segment 0612. The minimum observation was 97 counts/100 mL on June 13, 1990 and the maximum concentration was 1,520 counts/100 mL on June 25, 1991, which was the only exceedance of the 400 counts/100 mL instantaneous criterion for Attoyac Bayou. Table 5B-22 presents a summary of the available fecal coliform bacteria data for segment 0612.

5.3.2.4 Conventional Parameters

Segment 0611: Total Alkalinity

There are five stations with total alkalinity observations on segment 0611 streams. The 5 stations have a combined total of 39 total alkalinity observations. The minimum total alkalinity concentration, 4 mg/L, was observed at station 06110100 on February 11, 1991. The maximum observed total alkalinity concentration was 66 mg/L at station 14470 on June 12, 1996. There are no total alkalinity criteria to which the observed data can be compared. Table 5B-23 presents a summary of the total alkalinity data available for segment 0611.

Segment 0612: Total Alkalinity

There are 2 stations with total alkalinity observations on segment 0612 streams. The 2 stations have a combined total of 14 total alkalinity observations. The minimum total alkalinity concentration, 16 mg/L, was observed at stations 06120100 and 08038000 on June 25, 1991, and March 22, 1994, respectively. The maximum observed total alkalinity concentration was 44 mg/L at station 06120100 on July 15, 1992. There are no total alkalinity criteria to which the observed data can be compared. Table 5B-24 presents a summary of the total alkalinity data available for segment 0612.

June 2003 5-36 Historical Data Review for Sam Rayburn Reservoir

Segment 0611: Chloride

There are 9 monitoring stations with a total of 60 chloride observations on segment 0611. The average chloride concentration for each stream was calculated and compared to the 125 mg/L chloride criterion for segment 0611. The average chloride concentration in the Angelina River was 18.4 mg/L. The average chloride concentration in the East Fork Angelina River was 9.6 mg/L. There were not enough samples for Mud Creek or West Mud Creek to compare the concentrations to the criterion (at least 10 samples over a 5-year period are needed). There were no exceedances of the chloride criterion in the Angelina River or East Fork Angelina River. Table 5B-25 presents a summary of the available chloride data at segment 0611.

Segment 0612: Chloride

There are 2 stations with a total of 22 chloride observations on segment 0612. The average chloride concentration was 9.4 mg/L. There were no exceedances of the 75 mg/L chloride criterion for the Attoyac Bayou. Table 5B-26 presents a summary of the available chloride data for segment 0612.

Segment 0611: Sulfate

There are 60 sulfate observations among 9 monitoring stations on segment 0611. The average sulfate concentration on each stream segment was compared to the 50 mg/L criterion. The average sulfate concentration for the Angelina River was 22.2 mg/L, and the average sulfate concentration for the East Fork Angelina River was 40.9 mg/L. There were not enough observations (at least 10 samples over a 5-year period are needed) to calculate a sulfate average for Mud Creek or West Mud Creek. There were no exceedances of the criterion. Table 5B-27 presents a summary of the available sulfate data for segment 0611.

Segment 0612: Sulfate

There are 2 monitoring stations with a total of 22 sulfate observations on segment 0612. The average sulfate concentration on Attoyac Bayou was 14.7 mg/L. There were no exceedances of the 50 mg/L annual average sulfate criterion for the Attoyac Bayou. Table 5B-28 presents a summary of the available sulfate data for segment 0612.

Segment 0611: Total Suspended and Dissolved Solids

There are eight monitoring stations with total suspended solids observations and two stations with total dissolved solids observations in segment 0611. Total suspended solids (TSS) and total dissolved solids (TDS) are reported in the STORET database as total nonfiltered residue and dissolved residue, respectively. The eight stations have a combined total of 78 TSS observations. The minimum TSS value of 10.0 mg/L was observed at station 13788 (East Fork Angelina River) on December 27, 1993. The maximum observed TSS value was 64.0 mg/L at station 08037000 on February 13, 1997. Texas does not have TSS criteria to which the water quality data can be compared; however, none of the TSS observations were exceptionally high.

June 2003 5-37 Historical Data Review for Sam Rayburn Reservoir

Two stations on segment 0611 have a total of nine TDS observations. Average TDS concentrations at each station were compared to the appropriate water quality criterion. The minimum average concentration was 172.4 mg/L at station 14470 (Angelina River), and the maximum average concentration was 188.5 mg/L at station 14470. There were no exceedances of the Texas TDS criterion of 250 mg/L for segment 0611. Table 5B-29 presents a summary of the TSS and TDS data for segment 0611.

Segment 0612: Total Suspended and Dissolved Solids

There are two monitoring stations with TSS observations on segment 0612. There are no stations with TDS observations. TSS is reported in the STORET database as total nonfiltered residue. The two stations have a combined total of 22 TSS observations. The minimum TSS value, 4.0 mg/L, was observed at station 08038000 on August 21, 1996. The maximum observed TSS value was 100.0 mg/L at station 08038000 on January 27, 1994. There are no TSS criteria to which the data can be compared. Table 5B-30 presents a summary of the TSS data available for segment 612.

Segment 0611: Water Temperature

There are 9 monitoring stations with water temperature data and 93 temperature observations on the tributaries that make up segment 0611. The minimum temperature observed in segment 0611 was 37 °F at station 14477 on January 9, 1996. The maximum temperature 86.7 °F was observed at station 10532 on May 22, 1997. There were no exceedances of the 90 °F temperature criterion for segment 0611. Table 5B-31 presents a summary of the water temperature data collected for segment 0611.

Segment 0612: Water Temperature

There are two monitoring stations on segment 0612, and both stations have water temperature observations. There are 26 water temperature observations for Attoyac Bayou since 1990. The minimum temperature of 48.2 °F was observed at station 08038000 on February 9, 1995. The maximum observed temperature in Attoyac Bayou was 84.2 °F at station 08038000 on July 23, 1996. There were no exceedances of the 90 °F temperature criterion for segment 0612. Table 5B-32 presents a summary of the water temperature data collected for segment 0612.

Segment 0611: pH

There are 9 monitoring stations with a total of 93 pH observations on segment 0611. The minimum pH value of 5.5 was observed at station 06110100 on August 8, 1990. The maximum observed pH value was 7.5 at station 08037000 on January 27, 1994. The observations were compared to the Texas pH criteria, which require the pH of segment 0611 to be between 6 and 8.5. There were 5 exceedances of the criteria, and all 5 exceedances were slightly below the lower threshold of 6.0. All exceedances were in the main stem of the Angelina River, not in its tributaries. Table 5B-34 presents a summary of the pH data available for segment 0611.

June 2003 5-38 Historical Data Review for Sam Rayburn Reservoir

Segment 0612: pH

There are 2 stations with pH data on segment 0612, and they have a total of 26 pH observations. The minimum pH value, 5.9, was observed at station 08038000 on April 20, 1995. The maximum observed pH value was 7.5 at station 06120100 on June 25, 1991. The observations were compared to the Texas pH criteria, which require the pH of segment 0612 to be between 6.0 and 8.5. There was one exceedance of the criteria in April 1995 when the pH dropped below the lower threshold of 6.0. Table 5B-33 presents a summary of the pH data for segment 0612.

Segment 0611: Conductivity

There are 9 monitoring stations on segment 0611 with a total of 93 conductivity observations. The lowest conductivity observation was 42 µmos/cm at station 10551, and the maximum conductivity observation was 467 µmos/cm at station 10540, both on May 21, 1998. Texas does not have conductivity water quality criteria to which the data can be compared. Table 5B-34 presents a summary of the conductivity data for segment 0611.

Segment 0612: Conductivity

There are 2 monitoring stations with a total of 26 conductivity observations on segment 0612. The minimum conductivity observation was 84 µmos/cm at station 08038000 on August 29, 1995. The maximum observation was 200 µmos/cm, also at station 08038000, on January 27, 1994. Texas does not have conductivity criteria to which the data can be compared. Table 5B-35 presents a summary of the conductivity observations for segment 0612.

5.3.3 Impairment Summary

This section discusses any apparent impairments in the tributaries to the Sam Rayburn Reservoir (segments 0611 and 0612) as well as any tends observed in the STORET data. More detailed information of the number of observations, minimum observation, maximum observation, average, and number of exceedances of the applicable criterion or target for each parameter is found in Section 5.3.3 and the tables in Appendix 5B.

Dissolved Oxygen and Nutrients

There were no exceedances of the dissolved oxygen criteria for segments 0611 and 0612, however, the nutrient data for these segments were analyzed as potential contributions to the reservoir. Nitrite and nitrate, TKN, total phosphorus, orthophosphorus, and chlorophyll a all had exceedances of either the Texas nutrient screening levels or the EPA nutrient reference criteria or both on segments 0611 and 0612.

The only nitrite and nitrate observations that were higher than the Texas nutrient screening levels were all three samples on West Mud Creek (0611X) in November 1997, March 1998, and May 1998. Of the 19 observations of nitrite and nitrate on segment 0611, 18 were higher than EPA’s nutrient reference criterion. The high observations were observed at all stations without any particular seasonal trend. There were also two observations of nitrite and nitrate for segment 0612 from the early 1990s and both were higher than EPA’s nutrient reference criterion but below

June 2003 5-39 Historical Data Review for Sam Rayburn Reservoir

Texas’s nutrient screening levels. There were only 2 or 3 observations at each monitoring station, which makes it difficult to see any trends in the nitrite and nitrate loads entering the reservoir from the tributaries.

There were 17 TKN observations on segment 0611 streams and five observations were higher than EPA’s nutrient reference criterion for TKN. Mud Creek had the largest number of high observations with three in October 1995, and April and June 1996. Two additional samples were higher than the reference criterion in February 1993 and June 1996 on the Angelina River. There were no TKN data available for segment 0612.

There were no total phosphorus observations that were higher than the Texas screening level for total phosphorus on segment 0611 and 0612. However, there were several observations that were above EPA’s reference criteria for total phosphorus on both segments. There were 21 high observations of total phosphorus at the stations sampled on segment 0611. The largest percentage of high observations were on Angelina River and Mud Creek, but there were some high samples on the East Fork Angelina River also. There was no particular seasonal pattern to the high observations. There were three total phosphorus observations on Attoyac Bayou (0612) in the early 1990s and all three were higher than EPA’s reference criterion.

There are two samples of orthophosphorus at each of the five monitoring stations on segment 0611. There were no orthophosphorus data available for segment 0612. There were 5 observations on segment 0611 that were higher than the Texas screening level for orthophosphorus. All of the observations at Mud Creek and West Mud Creek were above the screening level in March and May 1998 and one additional high value was observed in the Angelina River in May 1998. There are not enough data at these stations to see any particular trends in the data with regard to seasons or streamflow. However, orthophosphorus is the form of phosphorus that is available to plants for uptake. Therefore, sampling for this parameter should be continued on a regular basis to determine if these high levels of orthophosphorus have the potential to be a problem for the reservoir.

There was one chlorophyll a sample that was above Texas’s screening level in the Angelina River in October 1995. Chlorophyll a also had 13 observations that were higher than EPA’s reference criterion at all stations on segment 0611 without a particular seasonal pattern. There was also one chlorophyll a sample that was higher than EPA’s reference criterion in July 1992 on Attoyac Bayou (segment 0612). There were no samples that were above the Texas screening level for chlorophyll a on Attoyac Bayou.

Overall, there were not enough continuous nutrient samples at the monitoring stations on segments 0611 and 0612 to get a good idea of whether there are any trends in the data associated with the seasons or streamflow in the watershed. Continuous sampling should occur in the watershed because the data do indicate that there are potentially high nutrient loads entering the reservoir from its tributaries.

June 2003 5-40 Historical Data Review for Sam Rayburn Reservoir

pH and Metals

There were five pH exceedances below the lower threshold of 6.0 on the main stem of the Angelina River (0611) in August 1990, November 1991, April and August 1995, and October 1996. There was one pH exceedance on April 1995 that was below the lower pH threshold of 6.0 on segment 0612. These exceedances were a very small percentage of the total number of observations for both stream segments (5 percent and 4 percent for segments 0611 and 0612, respectively).

As for metals, dissolved aluminum, dissolved copper, and dissolved lead all exceeded their appropriate criteria on segments 0611 and 0612. The dissolved zinc criterion was also exceeded on segment 0611.

Dissolved aluminum exceeded the criterion in the Angelina River (0611) on three dates in August and October 1990 and April 1991. There was only one dissolved aluminum observation available for Attoyac Bayou (segment 0612) and it exceeded the criterion in June 1991. The most recent dissolved aluminum data available for segments 0611 and 0612 were from 1991, so more recent conditions are not represented by the data.

There were 21 dissolved copper observations between segments 0611 and 0612 and all observations but one were below the detection limit of 10 µg/L. One sample of 11 µg/L on the Angelina River in October 1993 exceeds the acute criterion for dissolved copper of 5.6 µg/L. It is not known if any of the nondetect samples exceed the criterion since the detection limit was higher than the criterion. The detection limit for dissolved copper needs to be decreased for future sampling events to obtain observations that can be compared to the criterion.

There was one exceedance of aquatic life criterion for dissolved lead on the Angelina River (0611) in August 1995 and there were 4 exceedances of the 4.98 µg/L human health criterion (April 1994, April and August 1995, and August 1996). Six of the samples were nondetects (below the detection limit of 10 µg/L). The detection limit is below the acute criterion of 15.7 µg/L, but higher than the human health and chronic criteria. Therefore, it is unknown if any of the nondetect samples are actually exceeding the human health or chronic criteria. All 10 samples on Attoyac Bayou (0612) were also nondetects. There were no exceedances of the acute criterion, but it is unknown whether there were any exceedances of the human health or chronic criteria at Attoyac Bayou. The detection limit needs to be decreased for future sampling to obtain observations that can be compared to the appropriate criteria.

There was also one exceedance of the dissolved zinc criterion on the East Fork Angelina River during October 1993.

In general, there were some high observations of metals in the waterbodies of segments 0611 and 0612, but detection limits need to be lowered for future sampling events so that more accurate data can be obtained and compared to the appropriate criteria.

June 2003 5-41 Historical Data Review for Sam Rayburn Reservoir

Fecal Coliform Bacteria

The Angelina River, East Fork Angelina River, and Mud Creek all showed excceedances of the fecal coliform bacteria criterion on several occasions. There were seven exceedances on the main stem of the Angelina River. Six of those exceedances were at station 10633 at the confluence with the East Fork Angelina River. There were four exceedances on East Fork Angelina River and 5 exceedances on Mud Creek. There was also one exceedance on Attoyac Bayou in June 1991. The majority of the exceedances at all stations were in October and November of 1996 and May and June of 1997. There is not a strong relationship between flow and fecal coliform bacteria concentrations in the watershed. Therefore, it is likely that both point and nonpoint sources are contributing to the increased fecal coliform bacteria loading to the watershed.

Chloride and Sulfate

There were no exceedances of the chloride and sulfate criteria in segments 0611 and 0612.

June 2003 5-42 Historical Data Review for Sam Rayburn Reservoir

Appendix 5A Summary Tables for TRACS Water Quality Monitoring Data for Sam Rayburn Reservoir

June 2003 5A-1 Table 5A-1. Summary of Surficial DO grab samples for Segments 0611 and 0612 Segment Station Period Period Sample N < ID ID Begin End Depth Storet ID Parameter Min Max Avg N Criteria 611 10474 10/28/1996 7/11/2002 0.3 00300 DO (mg/l) 2.8 12.5 7.62 27 1 611 10475 10/28/1996 7/11/2002 0.3 00300 DO (mg/l) 5 12.8 9.30 27 611 10532 9/5/1996 7/22/2002 0.3 00300 DO (mg/l) 4.3 13.4 8.22 28 611 10536 12/5/2000 8/1/2002 0.3 00300 DO (mg/l) 5.4 14.5 8.80 8 611 10538 10/19/2000 7/25/2002 0.3 00300 DO (mg/l) 5.6 10 7.37 7 611 10539 2/22/1995 6/21/1995 0.3 00300 DO (mg/l) 7.1 9.5 7.93 3 611 10540 11/18/1997 7/22/2002 0.3 00300 DO (mg/l) 4.8 12 7.84 20 611 10542 12/29/1998 7/30/1999 0.3 00300 DO (mg/l) 4.7 10.5 7.29 9 611 10551 9/5/1996 7/12/2000 0.3 00300 DO (mg/l) 5.8 12.3 8.40 21 611 10552 10/13/1998 11/21/2002 0.3 00300 DO (mg/l) 6.5 11.8 8.75 15 611 10627 1/15/1990 11/12/2002 0.3 00300 DO (mg/l) 4.4 11.4 7.13 81 611 10630 11/17/1997 11/21/2002 0.3 00300 DO (mg/l) 5.2 10.6 7.81 22 611 10633 9/5/1996 7/22/2002 0.3 00300 DO (mg/l) 3.8 13.6 7.92 27 611 10635 11/29/2000 11/21/2002 0.3 00300 DO (mg/l) 6.2 11.1 9.04 7 611 13788 10/26/1993 11/6/1996 0.3 00300 DO (mg/l) 6.5 10.9 8.05 6 611 14470 10/31/1995 6/25/1997 0.3 00300 DO (mg/l) 4.7 12 7.58 9 611 14477 10/16/1995 8/1/2002 0.3 00300 DO (mg/l) 4.9 13.2 7.97 13 611 15806 8/27/1996 8/27/1996 0.3 00300 DO (mg/l) 6.6 6.6 6.60 1 611 15807 8/27/1996 8/27/1996 0.3 00300 DO (mg/l) 5.5 5.5 5.50 1 611 16289 10/12/1998 8/18/1999 0.3 00300 DO (mg/l) 7.8 11.4 9.22 6 611 16290 10/22/1998 8/18/1999 0.3 00300 DO (mg/l) 6.2 8.9 7.58 6 611 16291 10/22/1998 8/18/1999 0.3 00300 DO (mg/l) 7.7 10.4 8.88 6 611 16292 10/22/1998 3/26/1999 0.3 00300 DO (mg/l) 5.8 9 7.71 7 611 16294 10/12/1998 3/26/1999 0.3 00300 DO (mg/l) 8.4 11.2 9.47 7 611 16298 10/27/1998 8/30/2000 0.3 00300 DO (mg/l) 2.2 12.9 8.94 22 1 611 16300 10/13/1998 8/18/1999 0.3 00300 DO (mg/l) 6.7 10.1 7.93 7 611 16301 11/5/1998 7/13/2000 0.3 00300 DO (mg/l) 4.1 13.9 8.59 9 611 16302 10/13/1998 8/18/1999 0.3 00300 DO (mg/l) 8 9.5 8.60 6 611 16303 10/13/1998 6/22/1999 0.3 00300 DO (mg/l) 5.1 11.2 7.90 5 611 16304 10/12/1998 8/18/1999 0.3 00300 DO (mg/l) 7.8 9.8 8.45 6 611 16586 10/19/2000 7/25/2002 0.3 00300 DO (mg/l) 3.3 10.2 6.10 8 611 16587 7/14/1999 7/14/1999 0.3 00300 DO (mg/l) 1.3 1.3 1.30 1 1 611 17103 12/5/2000 7/25/2002 0.3 00300 DO (mg/l) 5.6 11.7 8.36 8 612 10636 6/13/1990 7/11/2002 0.3 00300 DO (mg/l) 4.9 11.8 7.78 61 612 15253 1/6/1997 7/10/1997 0.3 00300 DO (mg/l) 5.8 8.5 7.50 4 612 16076 11/20/1997 7/11/2002 0.3 00300 DO (mg/l) 5 12.8 8.66 20 612 16082 11/19/1997 3/24/1998 0.3 00300 DO (mg/l) 8.7 10.4 9.60 5 612 16083 11/19/1997 4/22/1998 0.3 00300 DO (mg/l) 8.4 10.4 9.52 6 612 16084 11/19/1997 4/22/1998 0.3 00300 DO (mg/l) 9.3 10.8 10.17 6 612 16085 11/19/1997 4/22/1998 0.3 00300 DO (mg/l) 9.8 10.8 10.38 6 Table 5A-2. Summary of Surficial 24-hour Minimum DO Data for Segments 0611 and 0612 Segment Period Period Sample N < ID Station ID Begin End Depth Storet ID Parameter Min Max Avg N Criteria 611 10627 7/22/1998 7/22/1998 0.5 89855 DISSOLVED OXYGEN, 24-HOUR MIN. (MG/L) MIN. 4 MEA 6 6 6 1 611 10627 7/28/1999 7/11/2000 0.6 89855 DISSOLVED OXYGEN, 24-HOUR MIN. (MG/L) MIN. 4 MEA 6.1 6.6 6.35 2 611 10627 5/5/1998 4/12/2000 1 89855 DISSOLVED OXYGEN, 24-HOUR MIN. (MG/L) MIN. 4 MEA 6.5 8.2 7.5 3 611 10630 8/28/1998 8/28/1998 0.3 89855 DISSOLVED OXYGEN, 24-HOUR MIN. (MG/L) MIN. 4 MEA 5.4 5.4 5.4 1 611 10633 5/25/2001 8/16/2002 0.3 89855 DISSOLVED OXYGEN, 24-HOUR MIN. (MG/L) MIN. 4 MEA 5.43 6.47 6 4 611 14477 6/28/2002 8/27/2002 0.3 89855 DISSOLVED OXYGEN, 24-HOUR MIN. (MG/L) MIN. 4 MEA 4.3 5.4 4.85 2 611 15806 10/21/1997 10/21/1997 0.3 89855 DISSOLVED OXYGEN, 24-HOUR MIN. (MG/L) MIN. 4 MEA 7.7 7.7 7.7 2 611 15807 10/21/1997 10/21/1998 0.3 89855 DISSOLVED OXYGEN, 24-HOUR MIN. (MG/L) MIN. 4 MEA 4.7 4.7 4.7 2 611 16586 7/15/1999 7/15/1999 0.3 89855 DISSOLVED OXYGEN, 24-HOUR MIN. (MG/L) MIN. 4 MEA 4.2 4.2 4.2 1 611 16587 7/14/1999 7/14/1999 0.3 89855 DISSOLVED OXYGEN, 24-HOUR MIN. (MG/L) MIN. 4 MEA 1.3 1.3 1.3 1 1 611 17103 6/28/2002 8/27/2002 0.3 89855 DISSOLVED OXYGEN, 24-HOUR MIN. (MG/L) MIN. 4 MEA 3.5 5.4 4.45 2 612 10636 5/16/2001 8/1/2001 0.3 89855 DISSOLVED OXYGEN, 24-HOUR MIN. (MG/L) MIN. 4 MEA 5.91 7.03 6.47 2 Table 5A-3. Summary of Surficial 24-hour Average DO Data for Segments 0611 and 0612 Segment Period Sample Storet N < ID Station ID Begin Period End Depth ID Parameter Min Max Avg N Criteria 611 10627 7/22/1998 7/22/1998 0.5 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 6.3 6.3 6.3 1 611 10627 7/28/1999 7/11/2000 0.6 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 6.6 6.6 6.6 2 611 10627 5/5/1998 4/12/2000 1 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 6.8 9 7.9 3 611 10630 8/28/1998 8/28/1998 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5.9 5.9 5.9 1 611 10633 5/25/2001 8/16/2002 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5.61 6.58 6.1 4 611 14477 6/28/2002 8/27/2002 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 4.9 5.5 5.2 2 1 611 15806 10/21/1997 10/21/1997 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 8 8 8 2 611 15807 10/21/1997 10/21/1998 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5.4 5.4 5.4 2 611 16586 7/15/1999 7/15/1999 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 4.4 4.4 4.4 1 1 611 16587 7/14/1999 7/14/1999 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 2.9 2.9 2.9 1 1 611 17103 6/28/2002 8/27/2002 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 5.6 5.7 5.65 2 612 10636 5/16/2001 8/1/2001 0.3 89857 DISSOLVED OXYGEN, 24-HOUR AVG. (MG/L) MIN. 4 MEA 6.08 7.1 6.59 2 Table 5A-4. Summary of Surficial Chlorophyll a Data for Segments 0611 and 0612 Segment Period Period N > ID Station ID Begin End Depth Storet ID Parameter Min Max Avg N Criteria >TCEQ 611 10539 10/6/1994 6/21/1995 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 3.6 1.67 4 4 611 10542 6/30/1999 6/30/1999 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 3.7 3.7 3.70 1 1 611 10552 2/5/2001 11/21/2002 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 2.85 1.31 7 7 611 10552 11/29/2000 11/29/2000 0.4 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 1 1.00 1 1 611 10627 1/15/1990 11/12/2002 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 9.1 2.02 37 37 611 10630 11/17/1997 11/21/2002 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 18.7 2.45 22 22 1 611 10635 11/29/2000 11/21/2002 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 3.56 1.50 8 8 611 13788 10/26/1993 7/22/1997 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 9.21 3.14 8 8 611 14470 10/31/1995 6/25/1997 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 17.7 3.98 8 8 1 611 14477 10/16/1995 6/12/1996 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1.67 8.55 3.63 4 4 611 15801 11/4/1997 11/4/1997 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 1 1.00 3 611 16587 7/14/1999 7/14/1999 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 2.52 2.52 2.52 1 1 611 16950 3/27/2000 3/27/2000 0.30488 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1.62 1.62 1.62 1 1 612 10636 6/13/1990 8/6/2002 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 10.2 2.60 8 8 612 10636 8/18/1994 8/18/1994 0.30488 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 5.8 5.8 5.80 1 1 612 15253 1/6/1997 7/10/1997 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 4.54 1.89 4 4 612 15802 11/5/1997 11/5/1997 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 1 1.00 1 612 16082 11/19/1997 3/24/1998 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 4.32 2.47 4 4 612 16083 11/19/1997 4/22/1998 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 4.46 2.28 5 5 612 16084 11/19/1997 5/27/1998 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 6.82 2.66 6 6 612 16085 11/19/1997 5/27/1998 0.3 32211 CHLOROPHYLL-A UG/L SPECTROPHOTOMETRIC ACID. METH 1 5.07 2.60 6 6 Table 5A-5. Summary of Surficial Sulfate Data for Segments 0611 and 0612 Segment Period Period ID Station ID Begin End Storet ID Parameter Min Max Avg N 611 10474 11/5/1998 7/11/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.3 1.1 0.72 10 611 10475 10/21/1999 7/11/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.15 1 0.51 8 611 10532 10/27/1999 7/23/2001 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.2 1.4 0.54 8 611 10536 12/5/2000 5/23/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.5 1.5 0.87 4 611 10538 10/19/2000 5/21/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.4 0.65 0.50 3 611 10539 2/22/1995 6/21/1995 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.15 0.9 0.52 3 611 10540 10/26/1999 7/22/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.3 0.7 0.48 11 611 10542 12/29/1998 6/4/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.3 0.5 0.39 4 611 10551 5/21/1998 7/12/2000 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.32 1 0.53 5 611 10552 11/29/2000 11/21/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.4 1.2 0.68 9 611 10627 1/15/1990 11/12/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.1 0.72 0.36 47 611 10630 11/17/1997 11/21/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.2 0.75 0.43 18 611 10633 10/27/1999 7/23/2001 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.2 1 0.48 6 611 10635 11/29/2000 11/21/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.2 0.7 0.48 8 611 13788 10/26/1993 11/6/1996 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.4 0.9 0.67 6 611 14470 10/31/1995 6/25/1997 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.34 1.2 0.63 9 611 14477 10/16/1995 5/23/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.38 0.9 0.55 8 611 15801 11/4/1997 11/4/1997 00078 TRANSPARENCY, SECCHI DISC (METERS) 1.8 1.8 1.80 1 611 16290 6/29/1999 6/29/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.7 0.7 0.70 1 611 16291 6/29/1999 6/29/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 1 1 1.00 1 611 16292 8/18/1999 8/18/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.4 0.4 0.40 1 611 16298 10/26/1999 8/30/2000 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.1 0.5 0.33 11 611 16301 10/21/1999 7/13/2000 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.45 1 0.61 4 611 16304 8/18/1999 8/18/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 1 1 1.00 1 611 16586 10/19/2000 5/21/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.2 0.8 0.49 5 611 16587 7/14/1999 7/14/1999 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.22 0.22 0.22 1 611 17103 12/5/2000 5/23/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.4 1 0.68 5 612 10636 6/13/1990 8/6/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.18 0.65 0.36 19 612 15253 1/6/1997 7/10/1997 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.2 0.41 0.26 4 612 15802 11/5/1997 11/5/1997 00078 TRANSPARENCY, SECCHI DISC (METERS) 1.22 1.22 1.22 1 612 16076 10/21/1999 4/30/2002 00078 TRANSPARENCY, SECCHI DISC (METERS) 0.3 1 0.47 9 Table 5A-6. Summary of Surficial Total Phosphorus Data for Segments 0611 and 0612 Segment Period Period N > ID Station ID Begin End Depth Storet ID Parameter Min Max Avg N Criteria >TCEQ 611 10474 5/20/1999 7/11/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.043 7.3 2.56 14 13 11 611 10475 5/20/1999 7/11/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.013 2.55 0.38 14 13 1 611 10532 5/19/1999 7/22/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.071 1.5 0.52 14 14 3 611 10536 12/5/2000 8/1/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.387 1.62 0.87 7 7 3 611 10538 10/19/2000 7/25/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.055 8.3 2.11 8 8 7 611 10539 10/6/1994 6/21/1995 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.23 1.75 0.73 4 4 1 611 10540 5/19/1999 7/22/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.133 5.6 1.96 14 14 9 611 10542 6/30/1999 6/30/1999 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.04 0.04 0.04 1 611 10551 4/29/1999 7/12/2000 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.038 1.216 0.41 7 6 2 611 10552 4/29/1999 11/21/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.05 1.3 0.19 10 7 1 611 10552 11/29/2000 11/29/2000 0.4 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.05 0.05 0.05 1 611 10627 1/15/1990 11/12/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.05 0.2 0.12 36 35 611 10630 11/17/1997 11/21/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.04 0.18 0.11 22 18 611 10633 5/19/1999 7/22/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.076 1.6 0.46 13 13 3 611 10635 11/29/2000 11/21/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.09 0.88 0.32 8 8 1 611 13788 10/26/1993 7/22/1997 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.01 0.12 0.05 8 3 611 14470 10/31/1995 6/25/1997 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.03 0.27 0.11 8 6 611 14477 10/16/1995 8/1/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.19 2 0.71 12 12 4 611 15801 11/4/1997 11/4/1997 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.01 0.01 0.01 3 611 16289 4/29/1999 8/18/1999 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.049 0.11 0.09 3 2 611 16290 4/28/1999 8/18/1999 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.096 1.116 0.46 3 3 1 611 16291 4/28/1999 8/18/1999 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.061 1.003 0.38 3 3 1 611 16292 4/28/1999 8/18/1999 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.033 0.318 0.14 3 2 611 16294 4/29/1999 8/18/1999 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.055 1.9 0.72 3 3 1 611 16300 3/31/1999 8/18/1999 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.061 0.073 0.07 4 4 611 16301 5/20/1999 7/13/2000 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.045 0.8 0.24 6 5 611 16302 4/28/1999 8/18/1999 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.02 0.164 0.08 3 2 611 16303 4/29/1999 6/22/1999 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.082 0.129 0.11 2 2 611 16304 4/28/1999 8/18/1999 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.048 0.07 0.06 3 2 611 16586 10/19/2000 7/25/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.006 1.47 0.56 8 7 1 611 16587 7/14/1999 7/14/1999 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.48 0.48 0.48 1 1 611 16950 3/27/2000 3/27/2000 0.30488 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.06 0.06 0.06 1 1 611 17103 12/5/2000 7/25/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.295 2.2 0.90 7 7 2 612 10636 6/13/1990 8/6/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.071 1.622 0.29 19 20 2 612 10636 8/18/1994 8/18/1994 0.30488 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.1 0.1 0.10 1 612 15253 1/6/1997 7/10/1997 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.12 0.19 0.15 4 4 612 15802 11/5/1997 11/5/1997 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.02 0.02 0.02 1 612 16076 5/20/1999 7/11/2002 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.024 0.863 0.25 13 12 1 612 16082 11/19/1997 3/24/1998 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.01 0.03 0.02 5 612 16083 11/19/1997 5/27/1998 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.01 0.1 0.05 7 4 612 16084 11/19/1997 5/27/1998 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.01 0.08 0.04 7 1 612 16085 11/19/1997 5/27/1998 0.3 00665 PHOSPHORUS, TOTAL, WET METHOD (MG/L AS P) 0.01 0.06 0.03 7 1 Table 5A-7. Summary of Surficial Orthophosphorus Data for Segments 0611 and 0612 Segment Period Period Sample N > ID Station ID Begin End Depth Storet ID Parameter Min Max Avg N Criteria 611 10474 10/21/1999 7/11/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.151 4.12 1.36 10 7 611 10475 10/21/1999 7/11/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.03 0.209 0.07 10 611 10532 10/27/1999 7/22/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.036 0.825 0.18 12 1 611 10536 12/5/2000 8/1/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.039 1.32 0.32 8 1 611 10538 10/19/2000 7/25/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.001 2.298 0.61 8 3 611 10539 10/6/1994 6/21/1995 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.15 0.67 0.29 4 1 611 10540 10/26/1999 7/22/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.016 2.008 0.97 12 10 611 10551 10/27/1999 7/12/2000 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.005 0.129 0.06 4 611 10627 1/15/1990 8/26/1999 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.11 0.04 53 611 10630 3/4/1998 3/4/1998 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.05 0.05 0.05 1 611 10633 10/27/1999 7/22/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.018 0.954 0.19 11 2 611 13788 10/26/1993 11/6/1996 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.02 0.05 0.03 7 611 14470 10/31/1995 1/9/1996 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.08 0.15 0.12 2 611 14477 10/16/1995 8/1/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.064 1.476 0.34 10 2 611 16300 3/31/1999 3/31/1999 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.044 0.044 0.04 1 611 16301 10/21/1999 7/13/2000 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.02 0.123 0.07 4 611 16586 10/19/2000 7/25/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.001 1.012 0.27 8 2 611 17103 12/5/2000 7/25/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.035 1.962 0.47 8 2 612 10636 6/13/1990 7/17/2001 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.712 0.05 46 1 612 10636 8/18/1994 8/18/1994 0.30488 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.05 0.05 0.05 1 612 16076 10/21/1999 7/11/2002 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.87 0.17 11 1 612 16082 12/19/1997 1/15/1998 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.01 0.01 2 612 16083 12/19/1997 1/15/1998 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.02 0.05 0.04 2 612 16084 12/19/1997 1/15/1998 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.03 0.02 2 612 16085 12/19/1997 1/15/1998 0.3 00671 PHOSPHORUS, DISSOLVED ORTHOPHOSPHORUS(MG/L AS P) 0.01 0.02 0.02 2 Table 5A-8. Summary of Surficial Total Nitrogen Data for Segments 0611 and 0612 Segment Period Period N > ID Station ID Begin End Parameter Min Max Avg N Criteria 611 10539 10/6/1994 6/21/1995 Total Nitrogen (mg/l) 1.33 6.7 3.66 4 4 611 10627 2/23/1993 6/8/1994 Total Nitrogen (mg/l) 0.48 1.28 0.73 6 4 611 10630 3/4/1998 3/4/1998 Total Nitrogen (mg/l) 0.78 0.78 0.78 1 1 611 13788 10/26/1993 11/6/1996 Total Nitrogen (mg/l) 0.43 0.76 0.54 7 3 611 14470 10/31/1995 10/28/1996 Total Nitrogen (mg/l) 0.36 0.64 0.48 3 1 611 14477 10/16/1995 1/9/1996 Total Nitrogen (mg/l) 1.59 3.11 2.35 2 2 612 10636 8/4/1993 8/18/1994 Total Nitrogen (mg/l) 0.98 1.05 1.02 2 2 612 16082 12/19/1997 1/15/1998 Total Nitrogen (mg/l) 0.11 0.27 0.19 2 612 16083 12/19/1997 1/15/1998 Total Nitrogen (mg/l) 0.45 0.52 0.49 2 1 612 16084 12/19/1997 1/15/1998 Total Nitrogen (mg/l) 0.78 0.79 0.79 2 2 612 16085 1/15/1998 1/15/1998 Total Nitrogen (mg/l) 0.34 0.34 0.34 1 Table 5A-9. Summary of Surficial Nitrite and Nitrite Data for Segments 0611 and 0612 Period Period N > Segment ID Station ID Begin End Storet ID Parameter Min Max Avg N Criteria >TCEQ 611 10474 7/23/1997 7/11/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.8 3.3 1.41 21 21 1 611 10475 7/23/1997 7/11/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.3 1.7 0.88 21 21 611 10532 11/18/1997 7/22/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 9 1.68 20 20 3 611 10536 12/5/2000 8/1/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.3 5.3 2.20 8 8 2 611 10538 10/19/2000 7/25/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.6 7.9 2.80 8 8 3 611 10539 10/6/1994 6/21/1995 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.4 5.81 2.95 4 4 2 611 10540 11/18/1997 7/22/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.8 13.4 4.39 20 20 15 611 10551 11/18/1997 7/12/2000 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.15 1.6 0.60 14 14 611 10552 10/13/1998 8/18/1999 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.2 0.5 0.37 6 6 611 10627 1/15/1990 1/18/1994 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.03 0.42 0.20 13 11 611 10630 3/4/1998 3/4/1998 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.06 0.06 0.06 1 611 10633 11/18/1997 7/22/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 2.65 0.81 19 19 611 13788 10/26/1993 11/6/1996 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.03 0.4 0.17 7 6 611 14470 10/31/1995 10/28/1996 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.01 0.24 0.11 3 2 611 14477 10/16/1995 8/1/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 3.66 1.67 10 10 2 611 16289 10/12/1998 8/18/1999 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.4 0.18 6 6 611 16290 10/22/1998 8/18/1999 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.2 0.6 0.34 6 6 611 16291 10/22/1998 8/18/1999 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.55 0.31 6 6 611 16292 10/22/1998 8/18/1999 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.3 1 0.60 6 6 611 16294 10/12/1998 8/18/1999 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.14 0.7 0.54 6 6 611 16300 10/13/1998 8/18/1999 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.2 0.9 0.61 7 7 611 16301 11/5/1998 7/13/2000 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 1.4 0.81 8 8 611 16302 10/13/1998 8/18/1999 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.3 0.75 0.53 6 6 611 16303 10/13/1998 6/22/1999 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.7 0.34 5 5 611 16304 10/12/1998 8/18/1999 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.02 0.6 0.42 6 5 611 16586 10/19/2000 7/25/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 6.3 1.67 8 8 1 611 17103 12/5/2000 7/25/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 4.3 2.08 8 8 3 612 10636 6/25/1991 7/17/2001 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.3 5.4 1.37 18 19 2 612 10636 8/18/1994 8/18/1994 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.52 0.52 0.52 1 612 16076 11/20/1997 7/11/2002 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.2 1.6 0.86 20 20 612 16082 12/19/1997 1/15/1998 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.02 0.03 0.03 2 612 16083 12/19/1997 1/15/1998 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.2 0.3 0.25 2 2 612 16084 12/19/1997 1/15/1998 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.5 0.6 0.55 2 2 612 16085 12/19/1997 1/15/1998 00630 NITRITE PLUS NITRATE, TOTAL 1 DET. (MG/L AS N) 0.1 0.1 0.10 2 2 Table 5A-10. Summary of Surficial TKN Data for Segments 0611 and 0612 Segment Period Period N > ID Station ID Begin End Storet ID Parameter Min Max Avg N Criteria 611 10539 10/6/1994 6/21/1995 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.38 0.88 0.68 4 3 611 10542 6/30/1999 6/30/1999 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.54 0.54 0.54 1 1 611 10552 2/5/2001 11/21/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.17 0.4 0.31 7 1 611 10552 11/29/2000 11/29/2000 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.47 0.47 0.47 1 611 10627 2/23/1993 11/12/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.27 0.87 0.53 25 19 611 10630 11/17/1997 11/21/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.3 0.86 0.53 22 15 611 10635 11/29/2000 11/21/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.35 0.64 0.46 8 4 611 13788 10/26/1993 7/22/1997 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.28 0.52 0.36 8 1 611 14470 10/31/1995 6/25/1997 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.28 0.72 0.45 8 3 611 14477 10/16/1995 6/12/1996 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.34 0.88 0.61 4 3 611 15801 11/4/1997 11/4/1997 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.16 0.6 0.39 3 1 611 16587 7/14/1999 7/14/1999 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 2.31 2.31 2.31 1 1 611 16950 3/27/2000 3/27/2000 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.65 0.65 0.65 1 1 612 10636 8/4/1993 8/6/2002 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.36 0.84 0.59 6 5 612 10636 8/18/1994 8/18/1994 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.42 0.42 0.42 1 612 15253 1/6/1997 7/10/1997 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.46 0.94 0.77 4 4 612 15802 11/5/1997 11/5/1997 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.54 0.54 0.54 1 1 612 16082 11/19/1997 3/24/1998 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.04 0.36 0.21 5 612 16083 11/19/1997 5/27/1998 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.13 0.52 0.26 7 1 612 16084 11/19/1997 5/27/1998 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.14 0.49 0.27 7 1 612 16085 11/19/1997 5/27/1998 00625 NITROGEN, KJELDAHL, TOTAL (MG/L AS N) 0.05 0.8 0.34 7 2 Table 5A-11. Summary of Surficial Amonia Data for Segments 0611 and 0612 Segment Period Period N > ID Station ID Begin End Storet ID Parameter Min Max Avg N Criteria 611 10474 7/23/1997 7/11/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.38 0.16 19 7 611 10475 7/23/1997 7/11/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.36 0.10 19 2 611 10532 11/18/1997 7/22/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.41 0.10 21 4 611 10536 12/5/2000 8/1/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.21 0.04 8 1 611 10538 10/19/2000 7/25/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.18 0.05 8 1 611 10539 10/6/1994 6/21/1995 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.05 0.03 4 611 10540 11/18/1997 7/22/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.6 0.14 20 4 611 10542 6/30/1999 6/30/1999 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.07 0.07 0.07 1 611 10551 11/18/1997 7/12/2000 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.02 0.23 0.07 15 1 611 10552 10/13/1998 11/21/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.4 0.09 13 2 611 10552 11/29/2000 11/29/2000 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.05 0.05 0.05 1 611 10627 1/15/1990 11/12/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.12 0.05 37 611 10630 11/17/1997 11/21/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.05 0.24 0.06 22 1 611 10633 11/18/1997 7/22/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.23 0.05 20 1 611 10635 11/29/2000 11/21/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.05 0.09 0.06 8 611 13788 10/26/1993 7/22/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.08 0.04 8 611 14470 10/31/1995 6/25/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.13 0.06 8 611 14477 10/16/1995 8/1/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.2 0.07 12 1 611 15801 11/4/1997 11/4/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.05 0.22 0.16 3 2 611 16289 10/12/1998 8/18/1999 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.15 0.06 6 611 16290 12/9/1998 8/18/1999 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.04 0.11 0.06 5 611 16291 2/9/1999 8/18/1999 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.06 0.05 4 611 16292 12/9/1998 8/18/1999 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.56 0.18 4 1 611 16294 10/12/1998 8/18/1999 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.12 0.06 6 611 16300 10/13/1998 8/18/1999 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.4 0.13 7 1 611 16301 11/5/1998 7/13/2000 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.21 0.09 7 2 611 16302 10/13/1998 8/18/1999 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.08 0.06 6 611 16303 10/13/1998 6/22/1999 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 0.78 0.29 5 3 611 16304 10/12/1998 8/18/1999 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.03 8.95 1.55 6 1 611 16586 10/19/2000 7/25/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.3 0.07 8 1 611 16587 7/14/1999 7/14/1999 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 1.72 1.72 1.72 1 1 611 16950 3/27/2000 3/27/2000 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.05 0.05 0.05 1 611 17103 12/5/2000 7/25/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.11 0.04 8 612 10636 6/13/1990 8/6/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 1.01 0.10 24 2 612 10636 8/18/1994 8/18/1994 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.04 0.04 0.04 1 612 15253 1/6/1997 7/10/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.02 0.05 0.03 4 612 15802 11/5/1997 11/5/1997 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.17 0.17 0.17 1 612 16076 11/20/1997 7/11/2002 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 1.4 0.16 20 2 612 16082 11/19/1997 3/24/1998 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.05 0.04 5 612 16083 11/19/1997 5/27/1998 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.14 0.06 7 612 16084 11/19/1997 5/27/1998 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.1 0.05 7 612 16085 11/19/1997 5/27/1998 00610 NITROGEN, AMMONIA, TOTAL (MG/L AS N) 0.01 0.16 0.06 6 Table 5A-12. Summary of Surficial BOD Data for Segments 0611 and 0612 Segment Period Period N > ID Station ID Begin End Depth Storet ID Parameter Min Max Avg N Criteria 611 10474 11/5/1998 3/9/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 15.4 4.0 7 NA 611 10475 11/5/1998 3/9/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 7 NA 611 10532 11/17/1998 4/5/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 7 NA 611 10540 11/16/1998 5/10/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 7 NA 611 10551 10/13/1998 4/5/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 9 NA 611 10552 10/13/1998 8/18/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 5 NA 611 10627 1/27/1994 8/26/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 0.6 3.1 1.5 36 NA 611 10633 11/17/1998 4/5/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 7 NA 611 16289 10/12/1998 8/18/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 6 NA 611 16290 10/22/1998 8/18/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 4.02 2.4 6 NA 611 16291 10/22/1998 8/18/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 5 NA 611 16292 10/22/1998 8/18/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 6 NA 611 16294 10/12/1998 8/18/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 6 NA 611 16300 10/13/1998 8/18/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 7 NA 611 16301 11/5/1998 3/9/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 4.03 2.6 7 NA 611 16302 10/13/1998 8/18/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.15 2.1 6 NA 611 16303 10/13/1998 6/22/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 5 NA 611 16304 10/12/1998 8/18/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 6 NA 612 10636 11/17/1998 8/26/1999 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 0.5 2.5 1.5 41 NA 612 16076 11/5/1998 4/18/2000 0.3 00310 BIOCHEMICAL OXYGEN DEMAND (MG/L, 5 DAY - 20DEG C 2.07 2.07 2.1 7 NA Table 5A-13. Summary of Surficial TOC Data for Segments 0611 and 0612 Segment Period Period ID Station ID Begin End Depth Storet ID Parameter Min Max Avg N 611 10539 10/6/1994 6/21/1995 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 1 11 6.00 4 611 10542 6/30/1999 6/30/1999 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 9 9 9.00 1 611 10552 2/5/2001 11/21/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 1 5 3.57 7 611 10552 11/29/2000 11/29/2000 0.4 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 6 6 6.00 1 611 10627 1/15/1990 11/12/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 1 19 8.16 70 611 10630 11/17/1997 11/21/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 5 12 6.97 22 611 10635 11/29/2000 11/21/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 4 6 5.13 8 611 13788 10/26/1993 7/22/1997 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 2 7 4.50 8 611 14470 10/31/1995 6/25/1997 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 1 8 5.75 8 611 14477 10/16/1995 6/12/1996 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 5 11 7.25 4 611 15801 11/4/1997 11/4/1997 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 1 7 4.67 3 611 16587 7/14/1999 7/14/1999 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 15 15 15.00 1 611 16950 3/27/2000 3/27/2000 0.30488 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 6 6 6.00 1 612 10636 6/13/1990 8/6/2002 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 3 14 7.22 42 612 10636 8/18/1994 8/18/1994 0.30488 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 5 5 5.00 1 612 15253 1/6/1997 7/10/1997 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 7 11 9.25 4 612 15802 11/5/1997 11/5/1997 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 6 6 6.00 1 612 16082 11/19/1997 3/24/1998 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 3 11 6.40 5 612 16083 11/19/1997 5/27/1998 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 3 7 4.71 7 612 16084 11/19/1997 5/27/1998 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 3 6 4.57 7 612 16085 11/19/1997 5/27/1998 0.3 00680 CARBON, TOTAL ORGANIC (MG/L AS C) 1 5 2.71 7 Table 5A-14. Summary of Dissolved Aluminum Data for Segment 0611

Dissolved Aluminum (µg/L) Station Start Date End Date Number of Number of Average Minimum Maximum Observations Exceedancesa

10474 4/11/1989 7/11/2002 5 74.4 <20 270 0

10475 6/23/1998 7/11/2002 4 20 <20 20.1 0

10532 6/17/1998 7/22/2002 4 269 <10 1026 1

10539 10/6/1994 2/22/1995 3 43 34 57 0

10540 11/16/1998 7/22/2002 3 16.4 <10 20 0

10551 6/17/1998 2/16/1999 2 15 <10 20 0

10552 2/16/1999 2/27/2002 7 84.8 <10 217 0

10627 1/28/1985 4/29/2002 46 585.8 0.6 2720 8

10630 10/14/1998 5/1/2001 6 252 136 418 0

10633 6/17/1998 7/22/2002 4 199.5 <10 748 0

10635 5/1/2001 5/1/2001 2 80 26 134 0

14470 4/16/1997 6/25/1997 2 151.5 121 182 0

15801 11/4/1997 11/4/1997 3 41 <41 <41 0

16289 2/16/1999 2/16/1999 1 10 <10 <10 0

16294 2/16/1999 2/16/1999 1 10 <10 <10 0

16301 11/5/1998 5/20/1999 2 20 <20 <20 0

16302 2/10/1999 2/10/1999 1 10 <10 <10 0 a Exceedance of TWQS 991 µg/L. Table 5A-15. Summary of Dissolved Aluminum Data for Segment 0612

Dissolved Aluminum (µg/L) Station Start Date End Date Number of Number of Average Minimum Maximum Observations Exceedancesa

10636 12/11/1984 7/11/2002 22 547.4 2.9 3800 3

15253 7/10/1997 7/10/1997 1 215 215 215 0

15802 11/5/1997 11/5/1997 1 41 <41 <41 0

16076 6/23/1998 7/11/2002 4 49.8 <20 139 0

16083 4/22/1998 4/22/1998 1 15 <15 <15 0

16084 4/22/1998 4/22/1998 1 22 <22 <22 0

16085 4/22/1998 4/22/1998 1 15 <15 <15 0 a Exceedance of TWQS 991 µg/L.

Table 5A-16. Summary of Dissolved Arsenic Data for Segments 0611 and 0612 Dissolved Arsenic (µg/L)

Station Start Date End Date Number of Number of Average Minimum Maximum Observations Exceedancesa

Segment 0611

10539 10/6/1994 2/22/1995 3 2.45 <2 3.34 0

10552 11/29/2000 2/27/2002 6 1.4 <1 2.42 0

10627 11/4/1997 4/29/2002 35 1.79 1 <8 0

10630 10/14/1998 5/1/2001 6 2.37 1.68 4.21 0

10635 5/1/2001 5/1/2001 2 1.23 <1 1.46 0

13788 10/26/1993 10/26/199 1 2 <2 <2 0 3

14470 4/16/1997 6/25/1997 2 2 <2 <2 0

15801 11/4/1997 11/4/1997 3 3.33 <2 <6 0

Segment 0612

10636 1/27/1994 3/13/2002 21 1.04 1 1.64 0

15253 7/10/1997 7/10/1997 1 2 <2 <2 0

15802 11/5/1997 11/5/1997 1 2 <2 <2 0

16083 4/22/1998 4/22/1998 1 3 <3 <3 0

16084 4/22/1998 4/22/1998 1 3 <3 <3 0 Dissolved Arsenic (µg/L)

Station Start Date End Date Number of Number of Average Minimum Maximum Observations Exceedancesa

16085 4/22/1998 4/22/1998 1 3 <3 <3 0 a Exceedance of chronic or acute TSWQS (190 µg/L and 390 µg/L).

Table 5A-17. Dissolved Copper Detections Exceeding Chronic and Acute Criteria for Segment 0611 Sample Specific Criteria Dissolved Sample Specific (µg/L) Station Date Copper Hardness (mg/L) (µg/L) Chronic Acute

10475 3/7/2001 11 52 7.0 9.9

10536 5/9/2001 16 56 7.5 10.7

10532 5/8/2002 6 NA NA NA

10538 5/2/2001 8 64 8.4 12.1

10540 5/10/2000 6 25.1 3.8 5.0

10540 5/2/2001 11 92 11.4 17.0

10633 5/8/2001 8 34 4.9 6.7

13788 10/26/1997 11 NA NA NA

14470 6/25/1997 6 36 5.1 7.0

14477 5/8/2001 6 58 7.7 11.0

16586 5/2/2001 8 38 5.4 7.4

17103 5/9/2001 12 60 7.9 11.4 Table 5A-18. Summary of Dissolved Copper Data for Segment 0611 Dissolved Copper (µg/L) Station Start Date End Date Number of Number of Average Minimum Maximum Observations Exceedancesa

10474 3/9/2000 7/11/2002 3 2.77 1.32 4 0

10475 3/9/2000 7/11/2002 3 4.87 0.62 11 1

10532 4/5/2000 7/22/2002 4 2.61 <1 6 1

10536 5/9/2001 5/9/2001 1 16 16 16 1

10538 5/2/2001 5/2/2001 1 8 8 8 1

10539 10/6/1994 2/22/1995 3 4 <4 <4 0

10540 5/10/2000 7/22/2002 3 6.59 2.77 11 2

10551 4/5/2000 4/5/2000 1 2 <2 2 0

10552 11/29/2000 2/27/2002 6 6 <6 <6 6b

10627 11/4/1997 4/29/2002 35 6.41 1.285 <10 21b

10630 10/14/1998 5/1/2001 6 3.5 <3 <6 1b

10633 4/5/2000 7/22/2002 4 3.34 <1 8 1

10635 5/1/2001 5/1/2001 2 6 <6 <6 2b

13788 10/26/1993 10/26/199 1 11 11 11 1 3

14470 4/16/1997 6/25/1997 2 5 4 6 1

14777 5/8/2001 5/8/2001 1 6 6 6 1

15801 11/4/1997 11/4/1997 3 3 <3 <3 0

16301 3/9/2000 3/9/2000 1 4 4 4 0

16586 5/2/2001 5/2/2001 1 8 8 8 1

17103 5/9/2001 5/9/2001 1 12 12 12 1 a Exceedances of calculated acute (5.9 µg/L) and or chronic (4.4 µg/L) criteria for segment 0611. B Exceedances based on nondetects. Table 5A-19. Summary of Dissolved Copper Data for Segment 0612 Dissolved Copper (µg/L) Station Start Date End Date Number of Number of Average Minimum Maximum Observations Exceedancesa

10636 3/9/2000 7/11/2002 22 7.87 0.83 <10 18b

15253 3/9/2000 7/11/2002 1 3 <3 <3 0

15802 4/5/2000 7/22/2002 1 3 <3 <3 0

16076 5/9/2001 5/9/2001 2 2.82 0.64 5 1

16083 5/2/2001 5/2/2001 1 4 4 4 0

16084 10/6/1994 2/22/1995 1 3 <3 <3 0

16085 5/10/2000 7/22/2002 1 3 <3 <3 0 a Exceedances of calculated acute (5.6 µg/L) and or chronic (4.1 µg/L) criteria for segment 0611. b Exceedances based on nondetects.

Table 5A-20. Dissolved Lead Detections Exceeding Chronic Criteria for Segment 0611 Dissolved Sample Specific Sample Specific Criteria (µg/L) Station Date Lead Hardness (µg/L) (mg/L) Chronic Acute 10475 3/7/2001 10 52 1.1 31.6

10532 7/22/2002 0.91 NA NA NA

10540 5/10/2000 16 25.1 0.43 12.5

10633 7/22/2002 0.77 NA NA NA Table 5A-21. Summary of Dissolved Lead Data for Segment 0611 Dissolved Lead (µg/L) Station Start Date End Date Number of Number of Average Minimum Maximum Observations Exceedancesa

10474 3/9/2000 7/11/2002 3 1.47 0.4 <2 2b

10475 3/9/2000 7/11/2002 3 4.03 0.1 10 2c

10532 4/5/2000 7/22/2002 4 1.64 0.91 <2 3d

10536 5/9/2001 5/9/2001 1 2 <2 <2 1b

10538 5/2/2001 5/2/2001 1 2 <2 <2 1b

10539 10/6/1994 2/22/1995 3 1 <1 <1 3b

10540 5/10/2000 7/22/2002 3 6.03 0.1 16 2c

10551 4/5/2000 4/5/2000 1 2 <2 <2 1b

10552 11/29/2000 2/27/2002 6 1 <1 <1 6b

10627 11/4/1997 4/29/2002 35 43.57 <1 <100 35b

10630 10/14/1998 5/1/2001 6 1.17 <1 <2 6b

10633 4/5/2000 7/22/2002 4 1.59 0.77 <2 3d

10635 5/1/2001 5/1/2001 2 1 <1 <1 2b

13788 10/26/1993 10/26/199 1 1 <1 <1 1b 3

14470 4/16/1997 6/25/1997 2 1 <1 <1 2b

14777 5/8/2001 5/8/2001 1 2 <2 <2 1b

15801 11/4/1997 11/4/1997 3 1 <1 <1 3b

16301 3/9/2000 3/9/2000 1 2 <2 <2 1b

16586 5/2/2001 5/2/2001 1 2 <2 <2 1b

17103 5/9/2001 5/9/2001 1 2 <2 <2 1b a Exceedances of chronic criterion (0.54 µg/L). b Exceedances based on nondetects. c All but one exceedances based on nondetects. d All but two exceedances based on nondetects. Table 5A-22. Dissolved Lead Detections Exceeding Chronic Criteria for Segment 0612 Sample Specific Dissolved Sample Specific Criteria (µg/L) Station Date Hardness Lead (µg/L) (mg/L) Chronic Acute 10636 5/11/2001 7 58 1.3 36.3

10636 7/11/2002 0.63 NA NA NA

Table 5A-23. Summary of Dissolved Lead Data for Segment 0612 Dissolved Lead (µg/L) Start Station End Date Date Number of Number of Average Minimum Maximum Observations Exceedancesa

10636 3/9/2000 7/11/2002 24 63.15 0.63 <100 24c

15253 3/9/2000 7/11/2002 1 1 <1 <1 1b

15802 4/5/2000 7/22/2002 1 1 <1 <1 1b

16076 5/9/2001 5/9/2001 3 1.48 0.45 <2 2b

16083 5/2/2001 5/2/2001 1 2 <2 <2 1b

16084 10/6/1994 2/22/1995 1 2 <2 <2 1b

16085 5/10/2000 7/22/2002 1 2 <2 <2 1b a Exceedances of chronic criterion (0.5 µg/L). b Exceedances based on nondetects. c All but two exceedances based on nondetects. Table 5A-24. Summary of Total Selenium Data for Segment 0611 Dissolved Selenium (µg/L) Station Start Date End Date Number of Number of Average Minimum Maximum Observations Exceedancesa

10474 4/6/1975 3/7/2001 8 8.63 <1 <20 3b

10475 5/20/1999 3/7/2001 4 2 <2 <2 0

10532 8/28/1997 3/5/2002 6 2.95 <2 <5 0

10536 5/9/2001 5/9/2001 1 2 <2 <2 0

10538 5/2/2001 5/2/2001 1 2 <2 <2 0

10540 5/19/1999 5/2/2001 4 2 <2 <2 0

10551 8/28/1997 4/5/2000 5 3.2 <2 <5 0

10552 12/14/1998 2/27/2002 3 2.7 <1.1 <5 0

10627 11/4/1997 4/29/2002 13 3.35 <1 <25 1b

10630 10/14/1998 6/16/1999 4 1.35 <1 <2.2 0

10633 8/28/1997 3/5//2002 6 2.5 <1 <5 0

14470 4/16/1997 6/25/1997 2 2.65 2.08 3.22 0

14777 5/8/2001 5/8/2001 1 3.5 <2 <2 0

15801 11/4/1997 11/4/1997 3 3.5 <2 <2 0

16289 12/14/1998 6/24/1999 2 3.5 <2 <5 0

16290 12/9/1998 6/29/1999 2 3.5 <2 <5 0

16291 12/9/1998 6/29/1999 2 3.5 <2 <5 0

16292 12/9/1998 6/17/1999 2 3.5 <2 <5 0

16294 12/14/1998 6/24/1999 2 3.5 <2 <5 0

16300 12/9/1998 6/22/1999 2 3.5 <2 <5 0

16301 5/20/1999 3/9/2000 3 2 <2 <2 0

16302 12/9/1998 6/22/1999 2 3.5 <2 <5 0

16303 12/14/1998 6/22/1999 2 3.5 <2 <5 0

16304 12/9/1998 6/22/1999 2 3.5 <2 <5 0

16586 5/2/2001 5/2/2001 1 2.8 2.8 2.8 0

17103 5/9/2001 5/9/2001 1 2 <2 <2 0 a Exceedances of chronic TSWQS for total selenium (5 µg/L). b Exceedances based on nondetects. Table 5A-25. Summary of Total Selenium Data for Segment 0612 Total Selenium (µg/L) Station Start Date End Date Number of Number of Average Minimum Maximum Observations Exceedancesa

10636 7/11/1974 3/13/2002 7 1.32 <2 <2 0

15253 7/10/1997 7/10/1997 1 2 <2 <2 0

15802 11/5/1997 11/5/1997 1 2 <2 <2 0

16076 5/20/1999 3/7/2001 4 2 <2 <2 0

10682 2/18/1998 2/18/1998 1 25 <25 <25 1b

16083 2/18/1998 2/18/1998 1 25 <25 <25 1b

16084 2/18/1998 2/18/1998 1 25 <25 <25 1b

16085 2/18/1998 2/18/1998 1 25 <25 <25 1b a Exceedances of chronic and acute criteria for total selenium (5 µg/L and 20µg/L). b Exceedances based on nondetects.

Table 5A-26. Dissolved Zinc Detections Exceeding Chronic and Acute Criteria for Segment 0611 Sample Dissolved Sample Specific Criteria (µg/L) Specific Station Date Zinc Hardness (µg/L) (mg/L) Chronic Acute

10532 5/8/2001 80 38 46.0 50.4

10536 5/9/2001 151 56 63.9 70.0

10538 5/2/2001 83 64 71.6 78.4

10539 2/22/2001 40 76 82.8 90.7

10540 5/2/2001 90 92 97.4 106.6

10633 5/8/2001 77 34 41.9 45.9

13788 10/26/1993 48 NA NA NA

14477 5/8/2001 75 58 65.9 72.1

16586 5/2/2001 82 38 46.0 50.4

17103 5/9/2001 92 60 67.8 74.2 Table 5A-27. Summary of Dissolved Zinc Data for Segment 0611 Dissolved Zinc (µg/L) Station Start Date End Date Number of Number of Average Minimum Maximum Observations Exceedancesa

10474 3/9/2000 7/11/2002 3 22.6 13 32 0

10475 3/9/2000 7/11/2002 3 12.9 0.74 34 0

10532 4/5/2000 7/22/2002 4 22.1 1 80 1

10536 5/9/2001 5/9/2001 1 151 151 151 1

10538 5/2/2001 5/2/2001 1 83 83 83 1

10539 10/6/1994 2/22/1995 3 23.1 <6.6 40 1

10540 5/10/2000 7/22/2002 3 34.6 1 90 1

10551 4/5/2000 4/5/2000 1 9 9 9 0

10552 11/29/2000 2/27/2002 6 8.3 <8 10 0

10627 11/4/1997 4/29/2002 35 9.79 <1 29.343 0

10630 10/14/1998 5/1/2001 6 13.5 <8 21.4 0

10633 4/5/2000 7/22/2002 4 22.4 <1 77 1

10635 5/1/2001 5/1/2001 2 8 <8 <8 0

13788 10/26/1993 10/26/199 1 48 48 48 1 3

14470 4/16/1997 6/25/1997 2 5 <4 6 0

14777 5/8/2001 5/8/2001 1 75 75 75 1

15801 11/4/1997 11/4/1997 3 17.3 12 26 0

16301 3/9/2000 3/9/2000 1 4 4 4 0

16586 5/2/2001 5/2/2001 1 82 82 82 1

17103 5/9/2001 5/9/2001 1 92 92 92 1 a Exceedances of calculated chronic (37.7 µg/L) and acute (41.3 µg/L) criteria for segment 0611. Table 5A-28. Summary of Dissolved Zinc Data for Segment 0612 Dissolved Zinc (µg/L) Start Station End Date Date Number of Number of Average Minimum Maximum Observations Exceedancesa

10636 1/27/1994 7/11/2002 24 11.9 <1 41 1

15253 7/10/1997 7/10/1997 1 4 <4 <4 0

15802 11/5/1997 11/5/1997 1 4 <4 <4 0

16076 4/18/2000 7/11/2002 3 10.74 <1 30 0

16083 4/22/1998 4/22/1998 1 24 24 24 0

16084 4/22/1998 4/22/1998 1 227 27 27 0

16085 4/22/1998 4/22/1998 1 18 18 18 0 a Exceedances of chronic (35.5 µg/L) and acute (38.9 µg/L) criteria for segment 0611. aObservations compared to metals water quality criteria for segment 612 (Source: Texas Administrative Code 307.6(c)(1) and 307.6(d)(1)) b All or some of the observations were below the detection limit Table 5A-29. Summary of Surficial Fecal Coliform Bacteria Data for Segments 0611 and 0612 Segment Period Period N > ID Station ID Begin End Storet ID Parameter Min Max Avg N Criteria 611 10474 10/1/1996 7/11/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 7 4900 634.70 27 8 611 10475 10/1/1996 7/11/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 4 15000 1479.30 27 15 611 10532 9/5/1996 7/22/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 8100 753.11 28 8 611 10536 12/5/2000 8/1/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 210 69.00 7 611 10538 10/19/2000 7/25/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 27 210 90.13 8 611 10539 2/22/1995 6/21/1995 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 97 800 345.67 3 1 611 10540 11/18/1997 7/22/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 16 300 98.25 20 611 10551 9/5/1996 7/12/2000 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 2 5800 641.35 20 4 611 10552 10/13/1998 11/29/2000 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 69 180 115.67 6 611 10627 1/15/1990 11/12/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 10 1240 196.29 45 3 611 10630 11/17/1997 8/28/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 22 1400 218.67 18 2 611 10633 9/5/1996 7/22/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 2200 410.96 27 9 611 10635 11/29/2000 11/29/2000 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 190 190 190.00 1 611 13788 10/26/1993 11/6/1996 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 53 200 110.67 6 611 14470 10/31/1995 6/25/1997 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 52 190 103.22 9 611 14477 10/16/1995 8/1/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 2 1000 163.00 13 2 611 16289 10/12/1998 8/18/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 39 280 118.80 5 611 16290 10/22/1998 8/18/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 100 390 236.67 6 611 16291 10/22/1998 8/18/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 160 380 282.00 5 611 16292 10/22/1998 8/18/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 120 400 243.33 6 611 16294 10/12/1998 8/18/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 110 1850 562.00 5 2 611 16300 10/13/1998 8/18/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 93 380 260.43 7 611 16301 11/5/1998 7/13/2000 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 2 1050 257.00 7 1 611 16302 10/13/1998 8/18/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 90 580 321.67 6 2 611 16303 10/13/1998 6/22/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 90 400 250.00 5 611 16304 10/12/1998 8/18/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 70 1030 310.00 6 1 611 16586 10/19/2000 7/25/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 53 200 102.88 8 611 16587 7/14/1999 7/14/1999 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 2000 2000 2000.00 1 1 611 17103 12/5/2000 7/25/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 196 63.57 7 612 10636 6/13/1990 8/6/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 1520 218.28 25 4 612 15253 1/6/1997 7/10/1997 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 83 1600 715.00 4 2 612 16076 11/20/1997 7/11/2002 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 2 2300 418.58 19 6 612 16082 11/19/1997 3/24/1998 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 130 42.20 5 612 16083 11/19/1997 5/27/1998 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 140 800 414.29 7 3 612 16084 11/19/1997 5/27/1998 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 140 380 285.71 7 612 16085 11/19/1997 5/27/1998 31616 FECAL COLIFORM,MEMBR FILTER,M-FC BROTH, #/100ML 1 1950 333.43 7 1 Table 5A-30. Summary of Surficial E. coli Data for Segments 0611 and 0612 Segment Period Period N > ID Station ID Begin End Storet ID Parameter Min Max Avg N Criteria 611 10474 10/25/2000 7/11/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 29.8 2420 811.65 8 3 611 10475 10/25/2000 7/11/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 19.9 3970 1657.89 8 6 611 10532 12/5/2000 7/22/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 35 727 176.53 8 1 611 10536 12/5/2000 8/1/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 35.9 397 132.19 7 1 611 10538 10/19/2000 7/25/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 36.8 727 178.55 8 1 611 10540 10/19/2000 7/22/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 31 290.89999 154.70 8 611 10552 2/5/2001 11/21/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 35 210 91.13 8 611 10627 2/7/2002 11/12/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 143 1842 641.00 4 2 611 10630 2/5/2001 11/21/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 30 122 56.14 7 611 10633 12/5/2000 7/22/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 38.8 602 170.16 7 1 611 10635 2/5/2001 11/21/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 36 272 101.29 7 611 14477 12/5/2000 8/1/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 14.8 1120 176.15 8 1 611 16586 10/19/2000 7/25/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 32.4 197 81.40 8 611 17103 12/5/2000 7/25/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 33 313 95.31 7 612 10636 11/15/2000 8/6/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 32.4 1373 376.22 9 3 612 16076 11/15/2000 7/11/2002 31699 E. COLI, COLILERT, IDEXX METHOD, MPN/100ML 95.9 461 286.11 8 2 Table 5A-31. Summary of Surficial Alkalinity Data for Segments 0611 and 0612

Segment Station Period Storet N > ID ID Begin Period End ID Parameter Min Max Avg N Criteria 611 10475 7/19/1999 7/19/1999 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 46.7 46.7 46.7 1 NA 611 10539 10/6/1994 6/21/1995 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 16.0 79.0 43.8 4 NA 611 10542 6/30/1999 6/30/1999 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 82.0 82.0 82.0 1 NA 611 10552 2/5/2001 11/21/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 13.0 22.0 16.9 7 NA 611 10552 11/29/2000 11/29/2000 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 15.0 15.0 15.0 1 NA 611 10627 1/15/1990 11/12/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 4.0 90.0 23.7 37 NA 611 10630 11/17/1997 11/21/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 8.0 44.0 23.5 22 NA 611 10635 11/29/2000 11/21/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 21.0 48.0 30.6 8 NA 611 13788 10/26/1993 7/22/1997 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 6.0 26.0 16.6 8 NA 611 14470 10/31/1995 6/25/1997 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 5.0 66.0 23.8 8 NA 611 14477 10/16/1995 6/12/1996 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 20.0 60.0 35.5 4 NA 611 15801 11/4/1997 11/4/1997 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 16.0 22.0 19.7 3 NA 611 16587 7/14/1999 7/14/1999 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 130.0 130.0 130.0 1 NA 611 16950 3/27/2000 3/27/2000 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 10.0 10.0 10.0 1 NA 612 10636 6/13/1990 8/6/2002 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 12.0 69.0 29.9 9 NA 612 10636 8/18/1994 8/18/1994 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 22.0 22.0 22.0 1 NA 612 15253 1/6/1997 7/10/1997 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 12.0 25.0 20.3 4 NA 612 15802 11/5/1997 11/5/1997 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 18.0 18.0 18.0 1 NA 612 16082 12/19/1997 3/24/1998 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 5.0 10.0 7.5 2 NA 612 16083 12/19/1997 5/27/1998 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 5.0 20.0 13.6 5 NA 612 16084 12/19/1997 5/27/1998 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 6.0 14.0 10.8 5 NA 612 16085 12/19/1997 5/27/1998 00410 ALKALINITY, TOTAL (MG/L AS CACO3) 5.0 8.0 5.8 5 NA Table 5A-32. Summary of Surficial Chloride Data for Segments 0611 and 0612 Segment Period Period N > ID Station ID Begin End Depth Storet ID Parameter Min Max Avg N Criteria 611 10474 7/23/1997 7/11/2002 0.3 00940 CHLORIDE (MG/L AS CL) 10.5 97 33.96 20 611 10475 7/23/1997 7/11/2002 0.3 00940 CHLORIDE (MG/L AS CL) 7.5 22.5 12.38 20 611 10475 7/19/1999 7/19/1999 0.30488 00940 CHLORIDE (MG/L AS CL) 8.62 8.62 8.62 1 611 10532 11/18/1997 7/22/2002 0.3 00940 CHLORIDE (MG/L AS CL) 9.5 35.9 19.08 20 611 10536 12/5/2000 8/1/2002 0.3 00940 CHLORIDE (MG/L AS CL) 10.5 30.5 24.65 8 611 10538 10/19/2000 7/25/2002 0.3 00940 CHLORIDE (MG/L AS CL) 15.5 33 27.00 8 611 10539 10/6/1994 6/21/1995 0.3 00940 CHLORIDE (MG/L AS CL) 9 44 27.50 4 611 10540 11/18/1997 7/22/2002 0.3 00940 CHLORIDE (MG/L AS CL) 17.5 51 37.32 20 611 10542 6/30/1999 6/30/1999 0.3 00940 CHLORIDE (MG/L AS CL) 29 29 29.00 1 611 10551 11/18/1997 7/12/2000 0.3 00940 CHLORIDE (MG/L AS CL) 6.8 17.5 11.26 14 611 10552 10/13/1998 11/21/2002 0.3 00940 CHLORIDE (MG/L AS CL) 6 142.39999 20.92 13 1 611 10627 1/15/1990 11/12/2002 0.3 00940 CHLORIDE (MG/L AS CL) 8 47 16.57 72 611 10630 11/17/1997 11/21/2002 0.3 00940 CHLORIDE (MG/L AS CL) 8 35 18.90 22 611 10633 11/18/1997 7/22/2002 0.3 00940 CHLORIDE (MG/L AS CL) 10.5 39 21.68 19 611 10635 11/29/2000 11/21/2002 0.3 00940 CHLORIDE (MG/L AS CL) 13 26 16.88 8 611 13788 10/26/1993 7/22/1997 0.3 00940 CHLORIDE (MG/L AS CL) 8 11 9.63 8 611 14470 10/31/1995 6/25/1997 0.3 00940 CHLORIDE (MG/L AS CL) 15 68 28.63 8 611 14477 10/16/1995 8/1/2002 0.3 00940 CHLORIDE (MG/L AS CL) 4 29 21.96 12 611 15801 11/4/1997 11/4/1997 0.3 00940 CHLORIDE (MG/L AS CL) 2.6 7.3 5.72 3 611 16289 10/12/1998 8/18/1999 0.3 00940 CHLORIDE (MG/L AS CL) 7.5 153.39999 33.37 6 1 611 16290 10/22/1998 8/18/1999 0.3 00940 CHLORIDE (MG/L AS CL) 8.5 182.39999 41.57 6 1 611 16291 10/22/1998 8/18/1999 0.3 00940 CHLORIDE (MG/L AS CL) 8.2 474.89999 123.42 6 2 611 16292 10/22/1998 8/18/1999 0.3 00940 CHLORIDE (MG/L AS CL) 13.5 171.39999 41.15 6 1 611 16294 10/12/1998 8/18/1999 0.3 00940 CHLORIDE (MG/L AS CL) 7.5 95 25.15 6 611 16300 10/13/1998 8/18/1999 0.3 00940 CHLORIDE (MG/L AS CL) 18.5 197.39999 60.11 7 1 611 16301 1/5/1999 7/13/2000 0.3 00940 CHLORIDE (MG/L AS CL) 11.2 16.5 13.90 7 611 16302 10/13/1998 8/18/1999 0.3 00940 CHLORIDE (MG/L AS CL) 8 134.5 32.75 6 1 611 16303 10/13/1998 6/22/1999 0.3 00940 CHLORIDE (MG/L AS CL) 16.5 25 19.70 5 611 16304 10/12/1998 8/18/1999 0.3 00940 CHLORIDE (MG/L AS CL) 9.5 103 27.75 6 611 16586 10/19/2000 7/25/2002 0.3 00940 CHLORIDE (MG/L AS CL) 13.5 34.5 21.56 8 611 16587 7/14/1999 7/14/1999 0.3 00940 CHLORIDE (MG/L AS CL) 29 29 29.00 1 611 16950 3/27/2000 3/27/2000 0.30488 00940 CHLORIDE (MG/L AS CL) 53 53 53.00 1 611 17103 12/5/2000 7/25/2002 0.3 00940 CHLORIDE (MG/L AS CL) 12 31.5 24.06 8 612 10636 6/13/1990 8/6/2002 0.3 00940 CHLORIDE (MG/L AS CL) 3 21.5 9.80 58 612 10636 8/18/1994 8/18/1994 0.30488 00940 CHLORIDE (MG/L AS CL) 7 7 7.00 1 612 15253 1/6/1997 7/10/1997 0.3 00940 CHLORIDE (MG/L AS CL) 7.26 18 12.32 4 612 15802 11/5/1997 11/5/1997 0.3 00940 CHLORIDE (MG/L AS CL) 5.73 5.73 5.73 1 612 16076 11/20/1997 7/11/2002 0.3 00940 CHLORIDE (MG/L AS CL) 7.9 18.5 12.05 19 612 16082 11/19/1997 3/24/1998 0.3 00940 CHLORIDE (MG/L AS CL) 8.2 84.4 25.10 5 1 612 16083 11/19/1997 5/27/1998 0.3 00940 CHLORIDE (MG/L AS CL) 7.8 12 10.24 7 612 16084 11/19/1997 5/27/1998 0.3 00940 CHLORIDE (MG/L AS CL) 7 11 9.17 7 612 16085 11/19/1997 5/27/1998 0.3 00940 CHLORIDE (MG/L AS CL) 7.6 14.5 9.81 7 Table 5A-33. Summary of Surficial Sulfate Data for Segments 0611 and 0612 Segment Period Period N > ID Station ID Begin End Depth Storet ID Parameter Min Max Avg N Criteria 611 10474 7/23/1997 7/11/2002 0.3 00945 SULFATE (MG/L AS SO4) 21.81 108 36.60 21 1 611 10475 7/23/1997 7/11/2002 0.3 00945 SULFATE (MG/L AS SO4) 9.3 35.8 22.36 21 611 10475 7/19/1999 7/19/1999 0.30488 00945 SULFATE (MG/L AS SO4) 11.6 11.6 11.60 1 611 10532 11/18/1997 7/22/2002 0.3 00945 SULFATE (MG/L AS SO4) 10.7 80 43.11 20 6 611 10536 12/5/2000 8/1/2002 0.3 00945 SULFATE (MG/L AS SO4) 16.59 40.4 27.84 8 611 10538 10/19/2000 7/25/2002 0.3 00945 SULFATE (MG/L AS SO4) 21.35 38.1 29.44 8 611 10539 10/6/1994 6/21/1995 0.3 00945 SULFATE (MG/L AS SO4) 3 28 17.00 4 611 10540 11/18/1997 7/22/2002 0.3 00945 SULFATE (MG/L AS SO4) 29.16 49.6 40.72 20 611 10542 6/30/1999 6/30/1999 0.3 00945 SULFATE (MG/L AS SO4) 29 29 29.00 1 611 10551 11/18/1997 7/12/2000 0.3 00945 SULFATE (MG/L AS SO4) 5.5 276.29999 35.92 14 1 611 10552 10/13/1998 11/21/2002 0.3 00945 SULFATE (MG/L AS SO4) 4 24 12.79 13 611 10627 1/15/1990 11/12/2002 0.3 00945 SULFATE (MG/L AS SO4) 11 63 21.58 72 1 611 10630 11/17/1997 11/21/2002 0.3 00945 SULFATE (MG/L AS SO4) 8 48 27.57 22 611 10633 11/18/1997 7/22/2002 0.3 00945 SULFATE (MG/L AS SO4) 9.7 49.3 27.38 19 611 10635 11/29/2000 11/21/2002 0.3 00945 SULFATE (MG/L AS SO4) 10 22 14.75 8 611 13788 10/26/1993 7/22/1997 0.3 00945 SULFATE (MG/L AS SO4) 8 21 13.13 8 611 14470 10/31/1995 6/25/1997 0.3 00945 SULFATE (MG/L AS SO4) 12 80 27.00 8 1 611 14477 10/16/1995 8/1/2002 0.3 00945 SULFATE (MG/L AS SO4) 3 45.3 27.35 12 611 15801 11/4/1997 11/4/1997 0.3 00945 SULFATE (MG/L AS SO4) 1 11.3 7.77 3 611 16289 10/12/1998 8/18/1999 0.3 00945 SULFATE (MG/L AS SO4) 6.4 17.44 11.94 6 611 16290 10/22/1998 8/18/1999 0.3 00945 SULFATE (MG/L AS SO4) 7.1 40.4 25.67 6 611 16291 10/22/1998 8/18/1999 0.3 00945 SULFATE (MG/L AS SO4) 5.8 3272 557.62 6 1 611 16292 10/22/1998 8/18/1999 0.3 00945 SULFATE (MG/L AS SO4) 10.3 34.8 23.99 6 611 16294 10/12/1998 8/18/1999 0.3 00945 SULFATE (MG/L AS SO4) 3.52 15.18 7.66 6 611 16300 10/13/1998 8/18/1999 0.3 00945 SULFATE (MG/L AS SO4) 0.3 25 8.24 7 611 16301 11/5/1998 7/13/2000 0.3 00945 SULFATE (MG/L AS SO4) 16.9 46.9 33.09 8 611 16302 10/13/1998 8/18/1999 0.3 00945 SULFATE (MG/L AS SO4) 0.37 31.7 7.61 6 611 16303 10/13/1998 6/22/1999 0.3 00945 SULFATE (MG/L AS SO4) 56 100.2 72.50 5 5 611 16304 10/12/1998 8/18/1999 0.3 00945 SULFATE (MG/L AS SO4) 3.74 30.9 13.57 6 611 16586 10/19/2000 7/25/2002 0.3 00945 SULFATE (MG/L AS SO4) 8.7 23.4 16.56 8 611 16587 7/14/1999 7/14/1999 0.3 00945 SULFATE (MG/L AS SO4) 21 21 21.00 1 611 16950 3/27/2000 3/27/2000 0.30488 00945 SULFATE (MG/L AS SO4) 24 24 24.00 1 611 17103 12/5/2000 7/25/2002 0.3 00945 SULFATE (MG/L AS SO4) 19.14 39 27.82 8 612 10636 6/13/1990 8/6/2002 0.3 00945 SULFATE (MG/L AS SO4) 0.1 162.5 19.45 58 1 612 10636 8/18/1994 8/18/1994 0.30488 00945 SULFATE (MG/L AS SO4) 13 13 13.00 1 612 15253 1/6/1997 7/10/1997 0.3 00945 SULFATE (MG/L AS SO4) 13 33 22.75 4 612 15802 11/5/1997 11/5/1997 0.3 00945 SULFATE (MG/L AS SO4) 5.24 5.24 5.24 1 612 16076 11/20/1997 7/11/2002 0.3 00945 SULFATE (MG/L AS SO4) 4.03 47.6 19.15 20 612 16082 11/19/1997 3/24/1998 0.3 00945 SULFATE (MG/L AS SO4) 11.3 444 100.62 5 1 612 16083 11/19/1997 5/27/1998 0.3 00945 SULFATE (MG/L AS SO4) 7.9 41.8 26.47 7 612 16084 11/19/1997 5/27/1998 0.3 00945 SULFATE (MG/L AS SO4) 4.2 42.6 24.73 7 612 16085 11/19/1997 5/27/1998 0.3 00945 SULFATE (MG/L AS SO4) 18.9 30 23.10 7 Table 5A-34. Summary of Surficial TSS Data for Segments 0611 and 0612 Segment Period Period ID Station ID Begin End Depth Storet ID Parameter Min Max Avg N 611 10474 7/23/1997 7/11/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 23.3 9.27 20 611 10475 7/23/1997 7/11/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 47.3 6.46 21 611 10475 7/19/1999 7/19/1999 0.30488 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 4 4 4.00 1 611 10532 11/18/1997 7/22/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 2.33 37 10.42 21 611 10536 12/5/2000 8/1/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 4 198 33.24 7 611 10538 10/19/2000 7/25/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 3 28.33 9.54 8 611 10539 10/6/1994 6/21/1995 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 5 25 11.25 4 611 10540 11/18/1997 7/22/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1.67 23.7 7.59 20 611 10542 6/30/1999 6/30/1999 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 6 6 6.00 1 611 10551 11/18/1997 7/12/2000 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 2 33.5 13.23 15 611 10552 10/13/1998 11/21/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 3 20 9.18 13 611 10552 11/29/2000 11/29/2000 0.4 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 34 34 34.00 1 611 10627 1/15/1990 11/12/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 65 22.99 71 611 10630 11/17/1997 11/21/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 4 64 20.27 22 611 10633 11/18/1997 7/22/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 2.33 31.3 8.49 20 611 10635 11/29/2000 11/21/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 4 58 22.00 8 611 13788 10/26/1993 7/22/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 14 6.25 8 611 14470 10/31/1995 6/25/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 3 33 16.88 8 611 14477 10/16/1995 8/1/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1.67 35 13.90 12 611 15801 11/4/1997 11/4/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 3 2.33 3 611 16289 10/12/1998 8/18/1999 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 3 1.72 6 611 16290 10/22/1998 8/18/1999 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 2.33 11 8.05 6 611 16291 10/22/1998 8/18/1999 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1 17.8 8.01 5 611 16292 10/22/1998 8/18/1999 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1.33 12.3 8.74 6 611 16294 10/12/1998 8/18/1999 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 2.67 15 7.64 6 611 16300 10/13/1998 8/18/1999 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 3 20.3 10.17 7 611 16301 11/5/1998 7/13/2000 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 2 13.7 5.57 8 611 16302 10/13/1998 8/18/1999 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 7 16.7 13.12 6 611 16303 10/13/1998 6/22/1999 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 4.33 13.5 7.50 5 611 16304 10/12/1998 8/18/1999 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 5 16.8 10.18 6 611 16586 10/19/2000 7/25/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1.33 21.3 8.33 8 611 16587 7/14/1999 7/14/1999 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 62 62 62.00 1 611 16950 3/27/2000 3/27/2000 0.30488 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 2 2 2.00 1 611 17103 12/5/2000 7/25/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 1.33 18 6.29 7 612 10636 6/13/1990 8/6/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 4 100 31.70 59 612 10636 8/18/1994 8/18/1994 0.30488 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 14 14 14.00 1 612 15253 1/6/1997 7/10/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 21 63 41.00 4 612 15802 11/5/1997 11/5/1997 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 4 4 4.00 1 612 16076 11/20/1997 7/11/2002 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 2.33 44.7 16.97 20 612 16082 11/19/1997 3/24/1998 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 3 19 8.00 4 612 16083 11/19/1997 5/27/1998 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 3 10 6.86 7 612 16084 11/19/1997 5/27/1998 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 5 20 10.29 7 612 16085 11/19/1997 5/27/1998 0.3 00530 RESIDUE, TOTAL NONFILTRABLE (MG/L) 2 113 21.43 7 Table 5A-35. Summary of Surficial TDS Data for Segments 0611 and 0612 Segment Station Period Period Storet N > ID ID Begin End ID Parameter Min Max Avg N Criteria 611 10474 11/5/1998 7/11/2002 70300 TDS (MG/L) 87 313 195.81 16 4 611 10475 11/5/1998 7/11/2002 70300 TDS (MG/L) 68 154 112.98 16 611 10532 11/17/1998 7/22/2002 70300 TDS (MG/L) 82 320 167.56 16 2 611 10536 12/5/2000 8/1/2002 70300 TDS (MG/L) 98 216 147.71 7 611 10538 10/19/2000 7/25/2002 70300 TDS (MG/L) 128 200 159.38 8 611 10539 10/6/1994 6/21/1995 70300 TDS (MG/L) 113 258 168.25 4 1 611 10540 11/16/1998 7/22/2002 70300 TDS (MG/L) 126.7 376 236.92 16 7 611 10542 6/30/1999 6/30/1999 70300 TDS (MG/L) 196 196 196 1 611 10551 10/13/1998 7/12/2000 70300 TDS (MG/L) 30 174 80.922 9 611 10552 10/13/1998 11/21/2002 70300 TDS (MG/L) 63.3 109 83.071 14 611 10627 8/25/1993 11/12/2002 70300 TDS (MG/L) 93 256 138.74 23 1 611 10630 11/17/1997 11/21/2002 70300 TDS (MG/L) 58 374 160.27 22 2 611 10633 11/17/1998 7/22/2002 70300 TDS (MG/L) 56 218 122.18 15 611 10635 11/29/2000 11/21/2002 70300 TDS (MG/L) 97 162 119.25 8 611 13788 10/26/1993 7/22/1997 70300 TDS (MG/L) 48 120 85.125 8 611 14470 10/31/1995 6/25/1997 70300 TDS (MG/L) 104 266 162.75 8 1 611 14477 10/16/1995 8/1/2002 70300 TDS (MG/L) 106 230 163.33 12 611 15801 11/4/1997 11/4/1997 70300 TDS (MG/L) 9 82 52.333 3 611 16289 10/12/1998 8/18/1999 70300 TDS (MG/L) 60 83.3 72.767 6 611 16290 10/22/1998 8/18/1999 70300 TDS (MG/L) 83.3 145 110.25 6 611 16291 10/22/1998 8/18/1999 70300 TDS (MG/L) 62.5 117 86.56 5 611 16292 10/22/1998 8/18/1999 70300 TDS (MG/L) 83.3 163 110.6 6 611 16294 10/12/1998 8/18/1999 70300 TDS (MG/L) 50 83.3 63.467 6 611 16300 10/13/1998 8/18/1999 70300 TDS (MG/L) 73.3 96.7 85.243 7 611 16301 11/5/1998 7/13/2000 70300 TDS (MG/L) 93 174 129.63 8 611 16302 10/13/1998 8/18/1999 70300 TDS (MG/L) 36.7 96.7 71.117 6 611 16303 10/13/1998 6/22/1999 70300 TDS (MG/L) 140 247 198.4 5 611 16304 10/12/1998 8/18/1999 70300 TDS (MG/L) 60 107 83.433 6 611 16586 10/19/2000 7/25/2002 70300 TDS (MG/L) 72 194 117.88 8 611 16587 7/14/1999 7/14/1999 70300 TDS (MG/L) 312 312 312 1 1 611 16950 3/27/2000 3/27/2000 70300 TDS (MG/L) 606 606 606 1 1 611 17103 12/5/2000 7/25/2002 70300 TDS (MG/L) 96 194 151.43 7 612 10636 8/18/1994 8/6/2002 70300 TDS (MG/L) 54 140 98.462 21 21 612 15253 1/6/1997 7/10/1997 70300 TDS (MG/L) 107 164 146.25 4 4 612 15802 11/5/1997 11/5/1997 70300 TDS (MG/L) 10100 10100 10100 1 1 612 16076 11/5/1998 7/11/2002 70300 TDS (MG/L) 44 147 89.981 16 15 612 16082 11/19/1997 3/24/1998 70300 TDS (MG/L) 69 748 225 5 5 612 16083 11/19/1997 5/27/1998 70300 TDS (MG/L) 82 134 106 7 7 612 16084 11/19/1997 5/27/1998 70300 TDS (MG/L) 64 690 183.29 7 7 612 16085 11/19/1997 5/27/1998 70300 TDS (MG/L) 84 113 98.429 7 7 Table 5A-36. Summary of Surficial Water Temperature Data for Segments 0611 and 0612 Segment Period Period N > ID Station ID Begin End Depth Storet ID Parameter Min Max Avg N Criteria 611 10474 10/28/1996 7/11/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 4.2 27.7 18.40 29 611 10475 10/28/1996 7/11/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 2.7 28 17.52 29 611 10532 9/5/1996 7/22/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 6.5 30.4 17.59 31 611 10536 12/5/2000 8/1/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 7 26.8 16.59 8 611 10538 10/19/2000 7/25/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 9.9 27 18.14 8 611 10539 2/22/1995 6/21/1995 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 11.2 22.9 16.10 3 611 10540 11/18/1997 7/22/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 9.8 27.9 19.30 20 611 10542 12/29/1998 7/30/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 8.7 28.5 19.03 9 611 10551 9/5/1996 7/12/2000 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 6.3 27.3 17.74 24 611 10552 10/13/1998 11/21/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 6.8 25.3 16.55 15 611 10627 1/15/1990 11/12/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 7.6 32 21.08 81 611 10630 11/17/1997 11/21/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 7.8 30.2 18.70 24 611 10633 9/5/1996 7/22/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 6.4 28.8 17.36 30 611 10635 11/29/2000 11/21/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 7.9 24.6 14.20 7 611 13788 10/26/1993 11/6/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 7.5 25.6 18.18 6 611 14470 10/31/1995 6/25/1997 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 3.5 25.1 15.44 9 611 14477 10/16/1995 8/1/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 2.8 27.7 15.51 13 611 15801 11/4/1997 11/4/1997 0.305 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 18.8 18.8 18.80 1 611 15806 10/21/1997 8/27/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 16.4 24.4 20.40 2 611 15807 10/21/1997 8/27/1996 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 16.6 25.1 20.85 2 611 16289 10/12/1998 8/18/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 11.5 24.8 18.88 6 611 16290 10/22/1998 8/18/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 12.1 25.9 20.03 6 611 16291 10/22/1998 8/18/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 11.6 27.8 20.40 6 611 16292 10/22/1998 3/26/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 12.4 24.9 18.69 7 611 16294 10/12/1998 3/26/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 12.1 23.9 18.76 7 611 16298 10/27/1998 8/30/2000 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 5.8 28 18.95 23 611 16300 10/13/1998 8/18/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 12.1 27.8 20.57 7 611 16301 11/5/1998 7/13/2000 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 4.9 27.5 16.58 9 611 16302 10/13/1998 8/18/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 11.9 23.6 19.58 6 611 16303 10/13/1998 6/22/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 9.7 22.5 17.80 5 611 16304 10/12/1998 8/18/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 12 24.1 19.83 6 611 16586 10/19/2000 7/25/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 8.5 27.1 18.11 8 611 16587 7/14/1999 7/14/1999 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 24.1 24.1 24.10 1 611 17103 12/5/2000 7/25/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 6.8 27 16.56 8 612 10636 6/13/1990 7/11/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 6.1 29 20.30 61 612 10636 8/18/1994 8/18/1994 0.30488 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 24.8 24.8 24.80 1 612 15253 1/6/1997 7/10/1997 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 14.2 24.8 17.98 4 612 15802 11/5/1997 11/5/1997 0.305 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 17.7 17.7 17.70 1 612 16076 11/20/1997 7/11/2002 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 2.2 26.4 16.35 20 612 16082 11/19/1997 3/24/1998 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 8.9 19.8 14.62 5 612 16083 11/19/1997 4/22/1998 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 9.6 16.1 12.38 6 612 16084 11/19/1997 4/22/1998 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 10.4 15.1 12.18 6 612 16085 11/19/1997 4/22/1998 0.3 00010 TEMPERATURE, WATER (DEGREES CENTIGRADE) 9.7 16.7 12.73 6 Table 5A-37. Summary of Surficial pH Data for Segments 0611 and 0612

Segmen Period Period N Outside t ID Station ID Begin End Depth Storet ID Parameter Min Max Avg N Criteria 611 10474 10/28/1996 7/11/2002 0.3 00400 PH (STANDARD UNITS) 6.2 7.4 7.05 29 611 10475 10/28/1996 7/11/2002 0.3 00400 PH (STANDARD UNITS) 6.9 7.7 7.27 29 611 10532 9/5/1996 7/22/2002 0.3 00400 PH (STANDARD UNITS) 6.1 7.9 6.98 31 611 10536 12/5/2000 8/1/2002 0.3 00400 PH (STANDARD UNITS) 6.7 8 7.05 8 611 10538 10/19/2000 7/25/2002 0.3 00400 PH (STANDARD UNITS) 7 7.9 7.38 8 611 10539 2/22/1995 6/21/1995 0.3 00400 PH (STANDARD UNITS) 6.5 7.2 6.90 3 611 10540 11/18/1997 7/22/2002 0.3 00400 PH (STANDARD UNITS) 6.6 7.5 7.12 20 611 10542 12/29/1998 7/30/1999 0.3 00400 PH (STANDARD UNITS) 6.6 7.2 7.00 9 611 10551 9/5/1996 7/12/2000 0.3 00400 PH (STANDARD UNITS) 5.8 7.9 6.87 24 1 611 10552 10/13/1998 11/21/2002 0.3 00400 PH (STANDARD UNITS) 5.5 7.1 6.69 15 1 611 10627 1/15/1990 11/12/2002 0.3 00400 PH (STANDARD UNITS) 5.4 7.9 6.76 81 5 611 10627 10/12/1999 8/15/2001 0.5 00400 PH (STANDARD UNITS) 7 7.4 7.18 4 611 10627 10/27/1993 11/12/2002 1 00400 PH (STANDARD UNITS) 6.2 7.6 6.71 16 611 10627 6/8/1994 11/12/2002 1.5 00400 PH (STANDARD UNITS) 6.2 6.7 6.45 2 611 10627 1/18/1994 1/18/1994 1.6 00400 PH (STANDARD UNITS) 7.5 7.5 7.50 1 611 10627 11/4/1997 4/29/2002 2 00400 PH (STANDARD UNITS) 6.2 6.9 6.54 10 611 10627 11/4/1997 1/20/1999 2.5 00400 PH (STANDARD UNITS) 6.3 6.7 6.43 3 611 10627 2/18/1998 2/7/2002 3 00400 PH (STANDARD UNITS) 6.2 6.9 6.60 3 611 10627 2/18/1998 2/18/1998 3.5 00400 PH (STANDARD UNITS) 6.2 6.2 6.20 1 611 10627 5/22/2001 5/22/2001 4 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 611 10627 5/22/2001 5/22/2001 5 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 611 10627 5/22/2001 5/22/2001 5.5 00400 PH (STANDARD UNITS) 6.7 6.7 6.70 1 611 10630 11/17/1997 11/21/2002 0.3 00400 PH (STANDARD UNITS) 6.3 7.5 6.90 22 611 10630 10/14/1998 10/14/1998 1 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 611 10633 9/5/1996 7/22/2002 0.3 00400 PH (STANDARD UNITS) 5.5 8 6.86 30 2 611 10635 11/29/2000 11/21/2002 0.3 00400 PH (STANDARD UNITS) 6.6 7.1 6.86 7 611 10635 7/11/2001 7/11/2001 0.4 00400 PH (STANDARD UNITS) 6.9 6.9 6.90 1 611 13788 10/26/1993 11/6/1996 0.3 00400 PH (STANDARD UNITS) 6.4 6.8 6.60 6 611 14470 10/31/1995 6/25/1997 0.3 00400 PH (STANDARD UNITS) 5.6 7.1 6.60 9 1 611 14477 10/16/1995 8/1/2002 0.3 00400 PH (STANDARD UNITS) 6.3 7.7 6.95 13 611 15801 11/4/1997 11/4/1997 0.305 00400 PH (STANDARD UNITS) 8.2 8.2 8.20 1 611 15801 11/4/1997 11/4/1997 1.52439 00400 PH (STANDARD UNITS) 8.1 8.1 8.10 1 611 15801 11/4/1997 11/4/1997 3.04878 00400 PH (STANDARD UNITS) 8.1 8.1 8.10 1 611 15801 11/4/1997 11/4/1997 4.57317 00400 PH (STANDARD UNITS) 8 8 8.00 1 611 15801 11/4/1997 11/4/1997 6.09756 00400 PH (STANDARD UNITS) 8 8 8.00 1 611 15801 11/4/1997 11/4/1997 7.62195 00400 PH (STANDARD UNITS) 8 8 8.00 1 611 15801 11/4/1997 11/4/1997 9.14634 00400 PH (STANDARD UNITS) 7.9 7.9 7.90 1 611 15801 11/4/1997 11/4/1997 10.67073 00400 PH (STANDARD UNITS) 7.8 7.8 7.80 1 611 15801 11/4/1997 11/4/1997 12.19512 00400 PH (STANDARD UNITS) 7.8 7.8 7.80 1 611 15806 10/21/1997 8/27/1996 0.3 00400 PH (STANDARD UNITS) 7.1 7.2 7.15 2 611 15807 10/21/1997 8/27/1996 0.3 00400 PH (STANDARD UNITS) 6.9 7.1 7.00 2 611 16289 10/12/1998 8/18/1999 0.3 00400 PH (STANDARD UNITS) 5.5 7 6.48 6 1 611 16290 10/22/1998 8/18/1999 0.3 00400 PH (STANDARD UNITS) 5 7 6.37 6 1 611 16291 10/22/1998 8/18/1999 0.3 00400 PH (STANDARD UNITS) 4.9 7.2 6.67 6 1 611 16292 10/22/1998 3/26/1999 0.3 00400 PH (STANDARD UNITS) 5.6 8.5 6.77 7 1 611 16294 10/12/1998 3/26/1999 0.3 00400 PH (STANDARD UNITS) 5.6 7.5 6.83 7 1 611 16298 10/27/1998 8/30/2000 0.3 00400 PH (STANDARD UNITS) 7 7.9 7.53 23 611 16300 10/13/1998 8/18/1999 0.3 00400 PH (STANDARD UNITS) 4.8 7.5 6.49 7 1 611 16301 11/5/1998 7/13/2000 0.3 00400 PH (STANDARD UNITS) 6.4 7.6 7.04 9 611 16302 10/13/1998 8/18/1999 0.3 00400 PH (STANDARD UNITS) 5 7.2 6.57 6 1 611 16303 10/13/1998 6/22/1999 0.3 00400 PH (STANDARD UNITS) 5.5 6.7 6.16 5 2 611 16304 10/12/1998 8/18/1999 0.3 00400 PH (STANDARD UNITS) 4.8 7 6.47 6 1 611 16586 10/19/2000 7/25/2002 0.3 00400 PH (STANDARD UNITS) 6.6 7.8 7.24 8 611 16587 7/14/1999 7/14/1999 0.3 00400 PH (STANDARD UNITS) 6.8 6.8 6.80 1 611 17103 12/5/2000 7/25/2002 0.3 00400 PH (STANDARD UNITS) 6.7 7.7 7.00 8 612 10636 6/13/1990 7/11/2002 0.3 00400 PH (STANDARD UNITS) 5.7 8.9 6.97 61 4 612 10636 8/18/1994 8/18/1994 0.30488 00400 PH (STANDARD UNITS) 7 7 7.00 1 4 612 10636 6/13/1990 6/13/1990 1.01 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 1 1 612 10636 7/15/1992 7/15/1992 1.52 00400 PH (STANDARD UNITS) 7.1 7.1 7.10 1 612 10636 6/13/1990 6/13/1990 2.01 00400 PH (STANDARD UNITS) 6.5 6.5 6.50 1 612 15253 1/6/1997 7/10/1997 0.3 00400 PH (STANDARD UNITS) 6.6 7.4 7.08 4 612 15802 11/5/1997 11/5/1997 0.305 00400 PH (STANDARD UNITS) 7.9 7.9 7.90 1 612 15802 11/5/1997 11/5/1997 1.52439 00400 PH (STANDARD UNITS) 7.9 7.9 7.90 1 612 15802 11/5/1997 11/5/1997 3.04878 00400 PH (STANDARD UNITS) 7.9 7.9 7.90 1 612 15802 11/5/1997 11/5/1997 4.57317 00400 PH (STANDARD UNITS) 7.8 7.8 7.80 1 612 15802 11/5/1997 11/5/1997 6.09756 00400 PH (STANDARD UNITS) 7.8 7.8 7.80 1 612 15802 11/5/1997 11/5/1997 7.62195 00400 PH (STANDARD UNITS) 7.5 7.5 7.50 1 612 15802 11/5/1997 11/5/1997 9.14634 00400 PH (STANDARD UNITS) 7.3 7.3 7.30 1 612 16076 11/20/1997 7/11/2002 0.3 00400 PH (STANDARD UNITS) 6.4 7.8 6.97 20 612 16082 11/19/1997 3/24/1998 0.3 00400 PH (STANDARD UNITS) 5.7 6 5.82 5 4 612 16083 11/19/1997 4/22/1998 0.3 00400 PH (STANDARD UNITS) 6.2 7 6.66 5 612 16084 11/19/1997 4/22/1998 0.3 00400 PH (STANDARD UNITS) 6.2 7.1 6.68 6 612 16085 11/19/1997 4/22/1998 0.3 00400 PH (STANDARD UNITS) 5.9 7.4 6.58 6 1 Table 5A-38. Summary of Surficial Conductivity Data for Segments 0611 and 0612 Segment Period Period ID Station ID Begin End Depth Storet ID Parameter Min Max Avg N 611 10474 10/28/1996 7/11/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 126 516 292.82 28 611 10475 10/28/1996 7/11/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 51 227 160.75 28 611 10532 9/5/1996 7/22/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 68 523 187.42 31 611 10536 12/5/2000 8/1/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 99 287 183.75 8 611 10538 10/19/2000 7/25/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 117 295 223.25 8 611 10539 2/22/1995 6/21/1995 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 84 257 189.33 3 611 10540 11/18/1997 7/22/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 246 738 382.89 19 611 10542 12/29/1998 7/30/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 240 322 277.44 9 611 10551 9/5/1996 7/12/2000 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 35 133 80.71 24 611 10552 10/13/1998 11/21/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 41 122 82.33 15 611 10627 1/15/1990 11/12/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 101 355 163.67 46 611 10630 11/17/1997 11/21/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 106 259 168.09 22 611 10633 9/5/1996 7/22/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 56 217 130.03 30 611 10635 11/29/2000 11/21/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 135 206 151.29 7 611 13788 10/26/1993 11/6/1996 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 80 112 95.83 6 611 14470 10/31/1995 6/25/1997 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 132 298 180.78 9 611 14477 10/16/1995 8/1/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 131 271 198.00 12 611 15801 11/4/1997 11/4/1997 0.305 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 93 93 93.00 1 611 15806 10/21/1997 8/27/1996 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 102 138 120.00 2 611 15807 10/21/1997 8/27/1996 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 230 252 241.00 2 611 16289 10/12/1998 8/18/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 33 74 49.83 6 611 16290 10/22/1998 8/18/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 83 120 101.50 6 611 16291 10/22/1998 8/18/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 64 111 87.50 6 611 16292 10/22/1998 3/26/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 74 123 98.86 7 611 16294 10/12/1998 3/26/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 33 58 45.00 7 611 16298 10/27/1998 8/30/2000 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 118 394 276.35 23 611 16300 10/13/1998 8/18/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 62 111 85.29 7 611 16301 11/5/1998 7/13/2000 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 136 219 182.67 9 611 16302 10/13/1998 8/18/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 21 100 40.83 6 611 16303 10/13/1998 6/22/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 196 304 240.40 5 611 16304 10/12/1998 8/18/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 44 92 67.33 6 611 16586 10/19/2000 7/25/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 81 337 169.25 8 611 16587 7/14/1999 7/14/1999 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 460 460 460.00 1 611 17103 12/5/2000 7/25/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 107 273 192.75 8 612 10636 6/13/1990 7/11/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 63 187 106.11 27 612 10636 8/18/1994 8/18/1994 0.30488 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 102 102 102.00 1 612 15253 1/6/1997 7/10/1997 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 75 193 135.00 4 612 15802 11/5/1997 11/5/1997 0.305 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 74 74 74.00 1 612 16076 11/20/1997 7/11/2002 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 42 145 91.79 19 612 16082 11/19/1997 3/24/1998 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 35 1110 268.40 5 612 16083 11/19/1997 4/22/1998 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 76 140 119.00 6 612 16084 11/19/1997 4/22/1998 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 46 144 111.67 6 612 16085 11/19/1997 4/22/1998 0.3 00094 SPECIFIC CONDUCTANCE,FIELD (UMHOS/CM @ 25C) 62 120 84.83 6 Historical Data Review for Sam Rayburn Reservoir

Appendix 5B Summary Tables for STORET Water Quality Monitoring Data for Sam Rayburn Reservoir

June 2003 5B-1 Historical Data Review for Sam Rayburn Reservoir

Table 5B-1. Summary of Dissolved Oxygen Data for Segment 0611 Dissolved Oxygen (mg/L) Station ID Start Date End Date Number of Number of Minimum Maximum Average Observations Exceedancesa 08037000 1/27/94 3/27/97 20 5.5 10.4 7.1 0 06110100 1/15/90 2/23/93 13 5.8 9.9 7.6 0 10633 9/5/96 5/21/98 11 6.0 10.5 7.5 0 14470 10/31/95 1/16/97 7 4.7 12.0 7.9 0 10551 9/5/96 5/21/98 9 6.5 10.9 8.3 0 13788 10/26/93 11/6/96 6 6.5 10.9 8.1 0 10532 9/5/96 5/21/98 10 5.5 10.8 7.8 0 14477 10/16/95 6/12/96 5 5.5 12.4 8.1 0 10540 11/18/97 5/21/98 3 5.5 9.9 8.2 0 aObservations compared to water quality criterion of 5.0 mg/L for segment 0611 (Source: Texas Administrative Code 307.10(1))

Table 5B-2. Summary of Dissolved Oxygen Data for Segment 0612 Dissolved Oxygen (mg/L) Number of Number of Station ID Start Date End Date Minimum Maximum Average Observations Exceedancesa 06120100 6/13/90 7/15/92 6 6.1 7.3 6.45 0 08038000 1/27/94 3/27/97 20 6.4 11.6 7.74 0 aObservations compared to water quality criterion of 5.0 mg/L for degment 0612 (Source: Texas Administrative Code 307.10(1))

Table 5B-3. Summary of Chlorphyll a Data for Segment 0611 Number of Chlorophyll a (µg/L) Station Exceedancesa Start Date End Date ID Number of Reference Screening Minimum Maximum Average Observations Criteria Level 06110100 1/15/90 2/23/96 13 1.0 9.1 3.2 5 0 14470 10/31/95 10/28/96 5 1.0 17.7 5.8 2 1 13788 10/26/93 11/6/96 7 1.0 9.2 3.2 3 0 14477 10/16/95 6/12/96 4 1.7 8.6 3.6 3 0 aCompared to 11.6 mg/L screening level for secondary concerns (Source: Guidance for Assessing Texas Surface and Finished Drinking Water Quality Data, 2002)

Table 5B-4. Summary of Chlorphyll a Data for Segment 0612 Number of Chlorophyll a (µg/L) Exceedancesa Station ID Start Date End Date Number of Reference Screening Observation Minimum Maximum Average Criteria Level s 06120100 6/13/90 7/15/92 3 1.0 10.2 4.4 1 0 aCompared to 11.6 mg/L screening level for secondary concerns (Source: Guidance for Assessing Texas Surface and Finished Drinking Water Quality Data, 2002)and reference criterion of 2.834 µg/L (EPA 2002)

June 2003 5B-2 Historical Data Review for Sam Rayburn Reservoir

Table 5B-5. Summary of Secchi Depth Data for Segment 0611 Secchi Depth (m) Station ID Start Date End Date Number of Minimum Maximum Average Observations 06110100 1/15/90 2/23/93 13 0.20 0.72 0.39 14470 10/16/95 6/12/96 5 0.38 0.80 0.53 10551 5/21/98 5/21/98 1 0.50 0.50 0.50 13788 10/26/93 11/6/96 6 0.40 0.90 0.67 10532 5/21/98 5/21/98 1 0.15 0.15 0.15 14477 10/16/95 6/12/96 5 0.38 0.80 0.53

Table 5B-6. Summary of Secchi Depth Data for Segment 0612 Secchi Depth (m) Station ID Start Date End Date Number of Minimum Maximum Average Observations 06120100 6/13/90 7/15/92 3 0.18 0.5 0.32

Table 5B-7. Summary of Total Phosphorus Data for Segment 0611 Number of Total Phosphorus (mg/L) Exceedancesa Station ID Start Date End Date Number of Reference Screening Minimum Maximum Average Observations Criteria Level 06110100 1/15/90 2/23/96 12 0.05 0.16 0.11 11 0 14470 10/31/95 10/28/96 5 0.05 0.27 0.13 4 0 13788 10/26/93 11/6/96 7 0.01 0.12 0.05 2 0 14477 10/16/95 6/12/96 4 0.20 0.53 0.32 4 0 aCompared to 0.8 mg/L screening level for secondary concerns (Source: Guidance for Assessing Texas Surface and Finished Drinking Water Quality Data, 2002) and the 0.05 mg/L reference criterion (Source: EPA 2000)

Table 5B-8. Summary of Total Phosphorus Data for Segment 0612 Number of Total Phosphorus (mg/L) Exceedancesa Station ID Start Date End Date Number of Reference Screening Minimum Maximum Average Observations Criteria Level 06120100 6/13/90 7/15/92 3 0.08 0.15 0.11 3 0 aCompared to 0.8 mg/L screening level for secondary concerns (Source: Guidance for Assessing Texas Surface and Finished Drinking Water Quality Data, 2002)

Table 5B-9. Summary of Orthophosphorus Data for Segment 0611 Total Ortho Phosphorus (mg/L) Station ID Start Date End Date Number of Number of Minimum Maximum Average Observations Exceedancesa 10633 3/3/98 5/21/98 2 0.50 0.98 0.74 1 14470 4/10/96 6/12/96 2 0.10 0.10 0.10 0 10551 3/3/98 5/21/98 2 0.28 0.30 0.29 0 10532 3/3/98 5/21/98 2 0.60 1.55 1.08 2 10540 3/3/98 5/21/98 2 1.00 2.20 1.60 2 aCompared to 0.5 mg/L screening level for secondary concerns (Source: Guidance for Assessing Texas Surface and Finished Drinking Water Quality Data, 2002).

June 2003 5B-3 Historical Data Review for Sam Rayburn Reservoir

Table 5B-10. Summary of NO2+NO3 Data for Segment 0611 Number of NO2+NO3 (mg/L) Exceedancesa Station ID Start Date End Date Number of Reference Screening Minimum Maximum Average Observations Criteria Level 10633 11/18/97 5/21/98 3 0.20 0.80 0.40 3 0 14470 10/31/95 10/28/96 3 0.01 0.24 0.11 2 0 10551 11/18/97 5/21/98 3 0.40 0.90 0.60 3 0 13788 8/7/95 11/6/96 2 0.03 0.22 0.13 1 0 10532 11/18/97 5/21/98 3 0.20 1.30 0.77 3 0 14477 10/16/95 1/9/96 2 1.19 2.42 1.81 2 0 10540 11/18/97 5/21/98 3 3.40 10.40 7.60 4 3 aCompared to the screening level of 2.76 mg/L (Source: Guidance for Assessing Texas Surface and Finished Drinking Water Quality Data, 2002) and the 0.067 mg/L reference criterion (Source: EPA 2000).

Table 5B-11. Summary of NO2+NO3 Data for Segment 0612 Number of NO2+NO3 (mg/L) Start Exceedancesa Station ID End Date Date Number of Reference Screening Minimum Maximum Average Observations Criteria Level 06120100 6/25/91 7/15/92 2 0.53 0.72 0.63 2 0 aCompared to the screening level of 2.76 mg/L (Source: Guidance for Assessing Texas Surface and Finished Drinking Water Quality Data, 2002) and the 0.067 mg/L reference criterion (Source: EPA 2000).

Table 5B-12. Summary of TKN Data for Segment 0611 TKN (mg/L) Station Start End Date Number of Number of ID Date Minimum Maximum Average Observations Exceedancesa 06110100 2/23/93 2/23/93 1 0.47 0.47 0.47 1 14470 10/31/95 10/28/96 5 0.28 0.72 0.40 1 13788 10/26/93 11/6/96 7 0.28 0.42 0.34 0 14477 10/16/95 6/12/96 4 0.34 0.88 0.61 3 aCompared to the 0.44 mg/L reference criterion (Source: EPA 2000).

Table 5B-13. Summary of Ammonia Data for Segment 0611 Ammonia (mg/L) Station Start Date End Date Number of Minimum Maximum Average Number of Exceedancesa Observation 08037000 1/27/94 3/27/97 20 0.000006 0.0004 0.0000837 0 06110100 1/15/90 2/23/93 13 0.000004 0.0001 0.00006 0 10633 8/28/97 5/21/98 4 0.00002 0.0003 0.000155 0 14470 6/12/96 6/12/96 1 0.0006 0.0006 0.0006 0 10551 11/18/97 5/21/98 3 0.00007 0.0003 0.00019 0 13788 5/26/94 7/21/94 2 0.0001 0.0002 0.00015 0 10532 11/18/97 5/21/98 3 0.00004 0.0005 0.00028 0 14477 6/12/96 6/12/96 1 0.0004 0.0004 0.0004 0 10540 11/18/97 5/21/98 3 0.0004 0.0009 0.0005667 0 aObservations compared to water quality screening level of 0.17 mg/L for freshwater streams (Source: TNRCC 2002)

June 2003 5B-4 Historical Data Review for Sam Rayburn Reservoir

Table 5B-14. Summary of Ammonia Data for Segment 0612 Ammonia (mg/L) Station ID Start Date End Date Number of Number of Minimum Maximum Average Observations Exceedances* 06120100 6/13/90 7/15/92 3 0.00004 0.001 0.0006467 0 08038000 1/27/94 3/27/97 20 0.00001 0.0002 0.0000845 0 *Observations compared to water quality screening level of 0.17 mg/L for freshwater streams (Source: TNRCC 2002)

Table 5B-15. Summary of BOD5 Data for Segment 0611

BOD5 (mg/L) Station ID Start Date End Date Number of Minimum Maximum Average Observations 08037000 1/27/94 3/27/97 20 0.6 2.4 1.4

Table 5B-16. Summary of the BOD5 Data for Segment 0612 BOD5 (mg/L) Station ID Start Date End Date Number of Minimum Maximum Average Observations 08038000 1/27/94 3/27/97 20 0.5 2.3 1.4

Table 5B-17. Summary of Total Organic Carbon Data for Segment 0611 TOC (mg/L) Station ID Start Date End Date Number of Minimum Maximum Average Observations 08037000 1/27/94 2/13/97 19 4.6 19.0 9.5 06110100 1/15/90 2/23/96 13 4.0 14.0 7.3 14470 10/31/95 10/28/96 5 4.0 8.0 6.4 13788 10/26/93 11/6/96 7 2.0 7.0 4.3 14477 10/16/95 6/12/96 4 5.0 11.0 7.3

Table 5B-18. Summary of Total Organic Carbon Data for Segment 0612 TOC (mg/L) Start Station ID End Date Number of Date Minimum Maximum Average Observations 06120100 6/13/90 7/15/92 3 3.0 8.0 6.0 08038000 1/27/94 2/12/97 18 4.2 11.0 7.1

June 2003 5B-5 Historical Data Review for Sam Rayburn Reservoir

Table 5B-19. Summary of Metals Data for Segment 0611 Number of Station Start Minimu Maximu Number of Metals (µg/L) End Date Observation Average ID Date m m Exceedancesa s Dissolved 08037000 1/27/94 2/13/97 10 1.0 2.0 1.2 0 Arsenic (As) 13788 10/26/93 10/26/93 1 2.0 2.0 2.0 0 Dissolved 06110100 1/15/90 8/28/91 7 310.0 2410.0 1,059.3 3 Aluminum (Al) Dissolved 08037000 1/27/94 2/13/97 10 10.0 10.0 10.0 0b Copper (Cu) 13788 10/26/93 10/26/93 1 11.0 11.0 11.0 1 Dissolved Lead 08037000 1/27/94 2/13/97 10 10.0 20.0 11.0 4 (Pb) 13788 10/26/93 10/26/93 1 1.0 1.0 1.0 0 Total Selenium 10633 8/28/97 8/28/97 1 5.0 5.0 5.0 0 (Se) Dissolved Zinc 08037000 1/27/94 2/13/97 10 3.0 18.0 8.2 0 (Zn) 13788 10/26/93 10/26/93 1 48.0 48.0 48.0 1 aObservations compared to metals water quality criteria for segment 0611 (Source: Texas Administrative Code 307.6(c)(1) and 307.6(d)(1)) b All or some samples below detection limit.

Table 5B-20. Summary of Metals Data for Segment 0612 Number of Station Minimu Maximu Number of Metals (µg/L) Start Date End Date Observation Average ID m m Exceedancesa s Dissolved 08038000 1/27/94 2/12/97 10 1 1 1 0 Arsenic (As) Dissolved 06120100 6/25/91 6/25/91 1 3560 3560 3560 1 Aluminum (Al) Dissolved 08038000 1/27/94 2/12/97 10 10 10 10 0b Copper (Cu) Dissolved Lead 08038000 1/27/94 2/12/97 10 10 10 10 0 (Pb) Dissolved Zinc 08038000 1/27/94 2/12/97 10 3 20 9.4 0 (Zn) aObservations compared to metals water quality criteria for segment 612 (Source: Texas Administrative Code 307.6(c)(1) and 307.6(d)(1)) b All or some of the observations were below the detection limit

Table 5B-21. Summary of Fecal Coliform Bacteria Data for Segment 0611 Fecal Coliform Bacteria (counts/100mL) Station Start Date End Date Number of Number of ID Minimum Maximum Average Observations Exceedancesa 06110100 1/15/90 2/23/96 12 10 805 183 1 10633 9/5/96 5/21/98 13 110 2200 665 6 14470 10/31/95 1/16/97 7 52 190 104 0 10551 9/5/96 5/21/98 11 120 5800 1028 4 13788 10/26/93 11/6/96 6 53 200 111 0 10532 9/5/96 5/21/98 12 130 8100 1197 4 14477 10/16/95 6/12/96 5 40 490 166 1 10540 11/18/97 5/21/98 3 40 150 93 0 aObservations compared to water quality criterion of 400 counts/100mL for segment 0611 (Source: Texas Administrative Code 307.10(1))

June 2003 5B-6 Historical Data Review for Sam Rayburn Reservoir

Table 5B-22. Summary of Fecal Coliform Bacteria Data for Segment 0612 Fecal Coliform Bacteria (counts/100mL) Start Number of Station ID End Date Number of Date Observation Minimum Maximum Average Exceedancesa s 06120100 6/13/90 6/25/91 2 97 1,520 808.5 1 aObservations compared to water quality criterion of 400 counts/100mL for segment 0612 (Source: Texas Administrative Code 307.10(1))

Table 5B-23. Summary of Total Alkalinity Data for Segment 0611 Total Alkalinity as CaCO3 (mg/L) Station ID Start Date End Date Number of Minimum Maximum Average Observations 08037000 3/22/94 8/31/95 10 15 34 23 06110100 1/15/90 2/23/93 13 4 29 16 14470 10/31/95 10/28/96 5 5 66 27 13788 10/26/93 11/6/96 7 6 20 15 14477 10/16/95 6/12/96 4 20 60 36

Table 5B-24. Summary of Total Alkalinity Data for Segment 0612 Total Alkalinity as CaCO3 (mg/L) Start Station ID End Date Number of Date Minimum Maximum Average Observations 06120100 6/13/90 7/15/92 3 16 44 27 08038000 1/27/94 8/29/95 11 16 28 21

Table 5B-25. Summary of Chloride Data for Segment 0611 Chloride (mg/L) Number of Station ID Start Date End Date Number of Observation Minimum Maximum Average Exceedancesa s 08037000 1/27/94 2/13/97 19 7.0 47.0 17.6 0 06110100 1/15/90 2/23/96 13 8.0 22.0 15.4 0 10633 11/18/97 5/21/98 3 13.0 26.0 18.3 0 14470 10/31/95 10/28/96 5 15.0 68.0 29.2 0 10551 11/18/97 5/21/98 3 7.0 12.0 9.7 0 13788 10/26/93 11/6/96 7 8.0 11.0 9.6 0 10532 11/18/97 5/21/98 3 12.0 27.0 18.7 0 14477 10/16/95 6/12/96 4 4.0 28.0 19.5 0 10540 11/18/97 5/21/98 3 31.0 51.0 38.3 0 aObservations compared to water quality criterion of 125 mg/L for segment 0611 (Source: Texas Administrative Code 307.10(1))

Table 5B-26. Summary of Chloride Data for Segment 0612 Chloride (mg/L) Number of Station ID Start Date End Date Number of Observation Minimum Maximum Average Exceedancesa s 06120100 6/13/90 7/15/92 3 3.0 9.0 7.0 0 08038000 1/27/94 2/12/97 19 7.0 15.0 9.7 0 aObservations compared to water quality criterion of 75 mg/L for segment 0612 (Source: Texas Administrative Code 307.10(1))

June 2003 5B-7 Historical Data Review for Sam Rayburn Reservoir

Table 5B-27. Summary of Sulfate Data for Segment 0611 Sulfate (mg/L) Start Station ID End Date Number of Number of Date Minimum Maximum Average Observations Exceedancesa 08037000 1/27/94 2/13/97 19 11.0 27.0 19.2 0 06110100 1/15/90 2/23/96 13 16.0 36.0 24.5 0 10633 11/18/97 5/21/98 3 12.0 22.0 18.0 0 14470 10/31/95 10/28/96 5 12.0 80.0 30.4 0 10551 11/18/97 5/21/98 3 12.0 276.0 104.0 0 13788 10/26/93 11/6/96 7 9.0 21.0 13.9 0 10532 11/18/97 5/21/98 3 26.0 39.0 32.3 0 14477 10/16/95 6/12/96 4 3.0 28.0 19.8 0 10540 11/18/97 5/21/98 3 29.0 45.0 38.3 0 aObservations compared to water quality criterion of 50 mg/L for segment 0611 (Source: Texas Administrative Code 307.10(1))

Table 5B-28. Summary of Sulfate Data for Segment 0612 Sulfate (mg/L) Station ID Start Date End Date Number of Number of Minimum Maximum Average Observations Exceedancesa 06120100 6/13/90 7/15/92 3 1.0 16.0 9.7 0 08038000 1/27/94 2/12/97 19 4.0 47.0 15.5 0 aObservations compared to water quality criterion of 50 mg/L for segment 0612 (Source: Texas Administrative Code 307.10(1))

Table 5B-29. Summary of TSS and TDS Data for Segment 0611 TSS (mg/L) Number of Station ID Start Date End Date Minimum Maximum Average Observations 08037000 1/27/94 2/13/97 19 10.0 64.0 29.5 06110100 1/15/90 2/23/93 13 4.0 41.0 18.8 10633 8/28/97 5/21/98 4 3.0 19.0 8.5 14470 10/31/95 10/28/96 5 3.0 29.0 15.6 13788 10/26/93 11/6/96 7 1.0 14.0 5.9 10532 11/18/97 5/21/98 3 3.0 26.0 11.7 14477 10/16/95 6/12/96 4 5.0 35.0 20.0 10540 11/18/97 5/21/98 3 4.0 7.0 5.0 TDS (mg/L) Number of Number of Station ID Start Date End Date Minimum Maximum Average Observations Exceedancesa 14470 10/31/95 10/28/96 5 111.0 266.0 172.4 0 14477 10/16/95 6/12/96 4 146.0 230.0 188.5 0 aObservations compared to water quality criterion of 6-8.5 pH for segment 0611 (Source: Texas Administrative Code 307.10(1))

Table 5B-30. Summary of TSS Data for Segment 0612 TSS (mg/L) Station ID Start Date End Date Number of Minimum Maximum Average Observations 06120100 6/13/90 7/15/92 3 10.0 87.0 53.3 08038000 1/27/94 2/12/97 19 4.0 100.0 36.4

June 2003 5B-8 Historical Data Review for Sam Rayburn Reservoir

Table 5B-31. Summary of Water Temperature Data for Segment 0611 Temperature (°F) Start Station ID End Date Number of Number of Date Minimum Maximum Average Observations Exceedancesa 08037000 1/27/94 3/27/97 20 46.4 86.0 69.7 0 06110100 1/15/90 2/33/93 13 49.1 81.0 64.2 0 10633 9/5/96 5/21/98 14 46.9 83.8 63.8 0 14470 10/31/95 1/16/97 7 38.3 73.4 58.0 0 10551 9/5/96 5/21/98 12 46.0 81.0 62.2 0 13788 10/26/93 11/6/96 6 45.5 78.1 64.7 0 10532 9/5/96 5/21/98 13 46.0 86.7 64.6 0 14477 10/16/95 6/12/96 5 37.0 71.2 57.7 0 10540 11/18/97 5/21/98 3 52.0 76.3 60.8 0 aObservations compared to water quality criterion of 90.0°F for egment 0611 (Source: Texas Administrative Code 307.10(1))

Table 5B-32. Summary of Water Temperature Data for Segment 0612 Temperature (°F) Station ID Start Date End Date Number of Number of Minimum Maximum Average Observations Exceedancesa 06120100 6/13/90 7/15/92 6 76.1 81.5 79.0 0 08038000 1/27/1994 3/27/1997 20 48.2 84.2 69.1 0 aObservations compared to water quality criterion of 90.0°F for segment 0612 (Source: Texas Administrative Code 307.10(1))

Table 5B-33. Summary of pH Data for Segment 0611 pH Start Station ID End Date Number of Number of Date Minimum Maximum Average Observations Exceedancesa 08037000 1/27/94 3/27/97 20 5.7 7.5 6.7 2 06110100 1/15/90 2/23/93 13 5.5 7.1 6.4 2 10633 9/5/96 5/21/98 14 6.1 7.2 6.8 0 14470 10/31/95 1/16/97 7 5.6 7.1 6.6 1 10551 9/5/96 5/21/98 12 6.3 7.1 6.8 0 13788 10/26/93 11/6/96 6 6.4 6.8 6.6 0 10532 9/5/96 5/21/98 13 6.1 7.3 6.8 0 14477 10/16/95 6/12/96 5 6.3 7.1 6.8 0 10540 11/18/97 5/21/98 3 6.9 7.2 7.1 0 aObservations compared to water quality criterion of 6-8.5 pH for segment 0611 (Source: Texas Administrative Code 307.10(1))

Table 5B-34. Summary of pH Data for Segment 0612 pH Number of Station ID Start Date End Date Number of Observation Minimum Maximum Average Exceedances* s 06120100 6/13/90 7/15/92 6 6.5 7.5 6.9 0 08038000 1/27/94 3/27/97 20 5.9 7.4 6.8 1 *Observations compared to water quality criterion of 6-8.5 pH for segment 0611 (Source: Texas Administrative Code 307.10(1))

June 2003 5B-9 Historical Data Review for Sam Rayburn Reservoir

Table 5B-35. Summary of Conductivity Data for Segment 0611 Conductivity (µmos) Station ID Start Date End Date Number of Minimum Maximum Average Observations 08037000 1/27/94 3/27/97 20 88 280 156 06110100 1/15/90 2/23/93 13 111 232 153 10633 9/5/96 5/21/98 14 56 200 126 14470 10/31/95 1/16/97 7 133 298 192 10551 9/5/96 5/21/98 12 42 132 88 13788 10/26/93 11/6/96 6 80 112 96 10532 9/5/96 5/21/98 13 79 273 153 14477 10/16/95 6/12/96 5 170 259 209 10540 11/18/97 5/21/98 3 325 467 383

Table 5B-36. Summary of Conductivity Data for Segment 0612 Conductivity (µmos) Start Station ID End Date Number of Date Minimum Maximum Average Observations 06120100 6/13/90 7/15/92 6 86 109 100 08038000 1/27/94 3/27/97 20 84 200 118

June 2003 5B-10 Historical Data Review for Sam Rayburn Reservoir

6.0 Source Assessment

6.1 Nonpoint Sources

Nonpoint sources represent contributions from diffuse, non-permitted sources. While they likely have a significant impact on water quality in Sam Rayburn Reservoir, it is difficult to generally assess the contribution. This section presents information on potential nonpoint sources in the watershed. It is expected that future modeling efforts will be used to represent and quantify nonpoint source pollutant loads.

Principal economic interests in the Sam Rayburn Reservoir watershed include lumbering, paper and wood products manufacturing, oil field pumping, recreation (water sports and fishing), tourism, education, and agriculture (poultry, dairy products, beef cattle, vegetables and fruits) (ACE 1998). El Hage and Moulton (1998) of the Texas Parks and Wildlife Department described in Evaluation of Selected Natural Resources in Angelina, Cherokee, Gregg, Nacogdoches, Rusk, and Smith Counties, Texas that “...the economy of the 6 county area consists primarily of petroleum production and refining, lumbering, beef cattle, poultry, and agribusiness. The agriculture market value in the study area is $286.8 million, mostly generated from timber production (Dallas Morning News 1997).” The economics of the area and the use of abundant natural resources likely affects the nonpoint source contributions to the watershed and reservoir.

Two primary nonpoint source categories (agriculture and urbanization) have been identified for this evaluation because of their potential for contributing to the impairments exhibited by the reservoir. For the purposes of this discussion, agricultural nonpoint sources may include crop farming, livestock operations (including beef, poulty, swine, or other livestock), and silviculture.

6.1.1 Agriculture

Agricultural practices in Texas are largely overseen by the Texas State Soil and Water Conservation Board (TSSWCB). This agency is the lead agency in planning, management, and abatement of agricultural and silvicultural nonpoint source pollution. Senate Bill 503, passed in 1993, authorized this agency to assist agricultural and silvicultural producers to meet state water quality goals through an incentive based voluntary program.

National Agricultural Statistics Service data for 1997 for the nine counties in the Sam Rayburn Reservoir watershed were reviewed to evaluate the magnitude of agricultural activities in the watershed that can potentially deliver pollutant loads to the reservoir. Table 6-1 summarizes the relevant data on crop and livestock related activities in the counties.

June 2003 6-1 Historical Data Review for Sam Rayburn Reservoir 0 63 241 278 999 1,844 1,069 2,864 44,129 59,968 32,285 31,449 250,855 127,336 127,148 128,147 Smith 60 NA NA 324 284 1,047 86,490 22,463 46,895 30,011 23,567 201,427 100,817 2,030,083 Shelby 72,928,627 75,059,527 17 39 12 NA 291 125 7,149 7,035 5,727 65,250 25,628 11,135 82,745 24,073 San 11,792,703 11,899,521 Augustine 0 15 78 NA NA 194 118 3,788 6,915 3,758 3,363 25,103 12,568 14,247 Sabine 5,566,080 5,580,327 93 NA 537 711 262 1,296 1,013 30,662 57,513 33,732 29,450 267,448 131,072 123,218 Rusk 3,774,133 3,897,351 County 7 63 88 NA NA 294 121 577 3936 6,416 3,725 3,365 62,108 10,376 13,722 14,299 Newton 463 480 693 117 1,200 2,641 26,482 59,460 36,582 32,029 372,451 101,669 839,651 132,002 69,164,986 70,136,639 Nacogdoches 20 NA NA 639 287 319 327 875 9,186 8,551 7,015 87,079 26,116 14,570 30,802 31,677 Jasper 34 NA 542 123 109 1,429 51,190 82,595 36,354 14,275 39,681 283,241 140,367 173,171 2,578,104 2,751,275 Cherokee 8 92 790 243 218 208 420 47,705 12,080 26,176 16,154 15,972 58,979 117,920 5,056,373 5,115,772 Angelina Number of Farms Number of acres in Farms Total croplands (acres) Harvested croplands (acres) Irrigated land (acres) Cattle and Calves (total number) Beef Cows (total number) Milk Cows (total number) Cattle and Calves sold (total number) Hogs and Pigs (total number) Hogs and Pigs sold (total number) Sheep and Lambs (total number) Layers and Pullets (total number) Broilers and meat-type chickens sold (total number) Total non Poultry Total Animal Units Table 6-1. National Agricultural Statistics Data from 1997 for the Nine County Region comprising Sam Rayburn River Watershed

June 2003 6-2 Historical Data Review for Sam Rayburn Reservoir

6.1.1.1 Crop Distribution

As summarized in Table 6-1, estimates of total cropland from the Agricultural Census data of 1997 identify that within the nine counties located at least partially in the watershed, 709,327 acres of land are cropland. MRLC (1992) data suggests that for the nine county region about 1,015,021 acres of land are cropland and about 66,069 acres are pasture or hay. Time periods and the proportion of the counties included in the landuse coverage of the watershed may explain some of the discrepancies.

Approximately 80 percent of the total cropland in the Sam Rayburn Reservoir watershed are in the northern half of the drainage in Cherokee, Nacogdoches, Rusk, Shelby, and Smith counties. The amount of harvested cropland is substantially smaller than the total amount of cropland suggesting that not all of the lands are in production. The amount of irrigated cropland is very low with respect to the total amount of cropland cited. Irrigation returns are often a potentially large nonpoint source of pollution in areas where crop farming on irrigated lands is high. However, given the small amount of irrigated acres, these returns are likely negligible sources to the Sam Rayburn Reservoir watershed.

Agricultural runoff can contribute increased pollutant loads when farm management practices allow soils rich in nutrients from fertilizers or animal waste to be washed into the stream, increasing in-stream sediment and phosphorus levels. The erosion potential of cropland and over- grazed pasture land is particularly high due to the lack of year-round vegetative cover. The use of cover crops and other management practices have been shown to reduce the transport of pollutant loads from agricultural lands.

6.1.1.2 Livestock Management

Based on the 1997 Agricultural Census data, poultry production is the largest livestock-related agricultural practice within the Sam Rayburn Reservoir watershed, followed by cattle production. Over 80 percent of the poultry production within the watershed occurs in the Attoyac Bayou (segment 0612) drainage area in Nacogdoches, San Augustine, and Shelby counties. Seven of the nine counties have poultry operations that sold several million birds, ranging from as 2.5 million in Cherokee County to over 70 million in Shelby County. Figure 6-1 illustrates the locations of poultry operations in the watershed. These facilities provide the potential for direct runoff from farms to headwater creeks that ultimately discharge to the reservoir. While unconfirmed, it is understood that waste from these facilities is applied to the land and managed under BMPs from Water Quality Management Plans developed in conjunction with the TSSWCB.

Overall, total animal production (summed number of animal units) ranged from about 14,300 in Newton County to over 75 million in Shelby County, the largest proportion of which is comprised of poultry. Only a portion of Shelby County lies within the Sam Rayburn Reservoir watershed. However, given the concentration of production facilities in nearby northeastern Nacogdoches County, the portion of Shelby County in the watershed may have a substantial number of production houses.

June 2003 6-3 Historical Data Review for Sam Rayburn Reservoir

Smith County %U%U Tyler

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$ Jacksonville C R $ A $ T S# T $ Shelby $ O Y County S#S# A $ C Cherokee $ Nacogdoches B $ A County County Y # #SS# O S #S#S#S# San #S S# U Nacogdoches S #S A SS# Augustine N $ $ S# # # S S# G S#S#S# $ E %U L $ $ IN $ $ A $ $ R $ $ $ $$

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%U $ $ %U S $ AM R R E A S Y %U Angelina ER B V U $ O R County IR N $ Newton County %U $

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$ Landfills %U Stormwater Outfalls #S Poultry Operations County Boundaries Reach File, Version 1 Populated Places Sam Rayburn Reservoir Watershed

0 30 60 Miles N

W E Sources: EPA's BASINS TNRIS S ANRA

Figure 6-1. Potential nonpoint sources of pollution in the Sam Rayburn Reservoir watershed

June 2003 6-4 Historical Data Review for Sam Rayburn Reservoir

Not including poultry, total animal units produced in the nine county region are relatively low, ranging from about 14,000 units in Sabine County to more than 170,000 units in Cherokee County. Cattle production is more prominent in the northern half of the watershed, in Cherokee, Nacogdoches, Rusk, Shelby and Smith counties. Cattle and other grazing animals can represent a significant source of nutrients and bacteria to streams, both through deposition on watershed surfaces and direct access to streams.

6.1.1.3 Silviculture

MRLC (1992) data presented in Section 3.0 indicate that forested land represents a substantial amount of the total acreage in the watershed. These lands represent a combination of national, state, and privately held properties. Data from the U.S. Forest Service’s Forest Inventory and Analysis Database Retrieval System were used to generate Tables 6-2 and 6-3. Table 6-2 indicates that a majority of the county lands are forested and that the bulk of those lands are considered to be timberland. Table 6-3 indicates ownership of these lands, of which a large proportion of the land is either privately held by the timber industry or other private individuals. Angelina, Jasper, Nacogdoches, Sabine, San Augustine, and Shelby Counties all contain portions of National Forest Lands. These data do not represent the number of acres in actual timber production, however, they do indicate the large acreage of land potentially available for timbering practices.

Table 6-2. Area by county and land class of forested lands in the nine county region of the Sam Rayburn Reservoir watershed Forested Lands County Other Forest Reserved Nonfores All Land Total Timberland Land Timberland t Land Thousands of acres Angelina 516.2 380.9 370 0 10.8 135.4 Cherokee 673.3 411.2 411.2 0 0 262.1 Jasper 589.5 520.6 508.9 0 11.8 68.9 Nacogdoches 601.1 379.7 379.7 0 0 221.4 Rusk 596.7 336.7 336.7 0 0 260 Sabine 310.8 276.2 265.1 0 11 34.6 San Augustine 335.3 283.7 278.4 0 5.3 51.6 Shelby 506 357.7 357.7 0 0 148.3 Smith 596.6 255.8 255.8 0 0 340.8 All counties 4,725.7 3,202.5 3,163.6 0 38.9 1,523.2 Source: Forest Inventory and Analysis Data Base Retrieval System

June 2003 6-5 Historical Data Review for Sam Rayburn Reservoir 48 239 93.2 77.7 137.3 170.3 283.5 208.9 112.3 1370.3 Private Individual 6 0 0 6.5 6.2 8.9 4.8 17.6 43.7 93.7 Corp. Private 0 6 0 6 6.2 64.6 26.6 27.9 87.3 224.6 Farmer/ Rancher 6.2 141 17.7 62.7 183.1 378.9 113.5 129.5 137.5 Forest 1170.1 Industry 0 0 6 0 0 0 0 0 11.7 17.7 Municipal County and 0 0 0 0 0 0 5.9 6.2 6.2 18.3 State Thousand Acres 0 0 0 0 0 0 0 0 0 0 Misc. Federal 0 0 0 0 0 0 0 0 0 0 Trust Tribal 0 0 0 0 0 0 0 0 0 0 Land Mngt. Bureau of 0 0 0 9.2 43.1 18.1 82.9 57.2 58.2 268.8 Forest National All 370 411.2 508.9 379.7 336.7 265.1 278.4 357.7 255.8 3163.6 Ownerships County Table 6-3. Area of timberland by county and ownership class in the nine region Sam Rayburn Reservoir watershed Angelina Cherokee Jasper Nacogdoches Rusk Sabine San Augustine Shelby Smith All counties - Timberland consist of nonreserved land only in this table for the following states: (TX). - Numbers in rows and columns may not add to totals due rounding. - The data are derived by sampling and subject to statistical error. - Source Southern FIA : Asheville, NC States:(AL,AR,FL,GA,KY,LA,MS,NC,OK,SC,TN,TX,VA) For assistance contact: Joe Glover 704-257-4350 homepage http://www.srsfia.usfs.msstate.edu

June 2003 6-6 Historical Data Review for Sam Rayburn Reservoir

Given these statistics, the timber and forest products industries may be significant nonpoint sources of nutrients, metals, and sedimentation in the Sam Rayburn Reservoir watershed. Communication with forest industry representatives as well as the TSSWCB indicate that BMPs are implemented to control soil loss and erosion from timbered areas to protect nearby watercourses. Investigation into the BMP process was from telephone conversations, thus data to examine where and to what extent BMPs have been implemented on National Forest and private forest lands are anecdotal. A number of sources indicate that the Texas Soil and Water Conservation Board is working closely with the forest products industry to implement and assess the effectiveness of the BMPs currently in place.

One such effort highlighted by ANRA’s Upper Neches Basin Highlights Report (2002) discusses a cooperative study called the Texas Intensive Forestry Study. Cooperators include Stephen F. Austin State University, Temple Inland Forest Products, and the National Council for Air and Stream Improvement. The study being conducted in the Alto Watershed in Cherokee County is focusing on the impacts that current silviculture practices have on nonpoint source water pollution. New data from this study will be used to assess the effectiveness of BMPs as compared to historical data. More information is available for this study at http://fri.sfasu.edu/projects/alto/alto.html.

6.1.2 Urban

Urban nonpoint sources may include runoff from population centers via stormwater, landfills, and septic systems among others and can contribute a variety of pollutants, including nutrients, bacteria, metals and sediment.

6.1.2.1 Population Centers

The population of the basin was determined by reviewing the Texas State Library and Archives Commission (TSLAC) Web Site, which reports various tables of Texas data from the Bureau of the Census (2000). Table 6-4 summarizes the available population data for the Sam Rayburn Reservoir counties.

Table 6-4. 2000 Census data for nine counties in the Sam Rayburn Reservoir watershed County Populationa Angelina 80,130 Cherokee 46,659 Jasper 35,604 Nacogdoches 59,203 Rusk 47,372 Sabine 10,469 San Augustin 8,946 Shelby 25,224 Smith 174,706 a per the Bureau of the Census (2000 Census) as reported at http://castor.tsl.state.tx.us/ref/abouttx/popcnty12000.html

June 2003 6-7 Historical Data Review for Sam Rayburn Reservoir

Smith County has the largest county population, but only approximately one-third of its largest population center (Tyler with a population of 83,650) is in the watershed. The city of Nacogdoches (population of 29,914) is the largest population center completely contained within the basin. Figure 6-1 illustrates the primary population centers within the watershed. Figure 6-1 also illustrates available information on stormwater outfalls. These are not classified as industrial or municipal. Runoff from urbanized areas, either through stormwater outfalls or as direct runoff to nearby ditches or streams, may carry large amounts of contaminants, including nutrients, sediment, and bacteria. However, the Sam Rayburn Reservoir watershed is largely rural, and the major populations centers are relatively small when compared to a large metropolitan city such as Dallas or Fort Worth. Structures that reduce soil permeability, such as road surfaces, buildings, or other hard surfaces that would facilitate increased runoff appear to be low in this watershed.

6.1.2.2 Land Fills

Figure 6-1 illustrates landfills known to exist within the watershed. These include both historic and currently operating facilities. Several are found in and around the Lufkin area, but how many of these are currently operating is unknown. Land fills can contribute to nonpoint source pollution in a variety of ways, including leaching through soils to groundwater tables or acting as impoundment structures that retain water that must be discharged.

6.1.2.3 On Site Sewage Facilities

ANRA currently enforces a permit and compliance system for on site sewage facilities (OSSF) that fall within a 2000 foot buffer around the reservoir. Currently, ANRA has on record 3,834 seperate OSSFs. By County, OSSFs are distributed as follows: Jasper County 262 (7 %), San Augustine 1,159 (30 %), Sabine 283 (7 %), Angelina 1,475 (38.5 %), Nacogdoches 651 (17 %). Over 60 percent of the OSSFs around the reservoir are located in these counties. In December 2000, ANRA began documenting the locations of these OSSFs using GPS equipment. Locations of GPS identified systems are illustrated in Figure 6-2. This figure represents only those OSSFs that have been recently installed or updated through the permit system and identified using GPS coordinates (approximately 188 OSSFs). Many permitted facilities exist and are known by physical address location, but are not represented in Figure 6-2. Many unpermitted systems are also known to exist as well. Some of these unpermitted systems are a direct pipe discharge of septic effluent, which can represent significant sources of such pollutants as nutrients and bacteria.

Based on the distribution of OSSFs illustrated in Figure 6-2, it does appear that more OSSFs are found in the northwestern section of the reservoir (segment 0610) as opposed to the southwestern section; however, the numbers of OSSFs represented in Figure 6-2 represent a small fraction of the total number documented by ANRA.

Septic facilities, given their numbers and proximity to the reservoir, may contribute elevated nutrients and bacteria to the reservoir. These systems do not account for those septic systems that fall outside of the 2000 foot buffer zone, however, in a rural population such as exhibited in the counties making up the Sam Rayburn Reservoir watershed, septic systems are often the dominant means of sewage disposal. Most are not likely to contribute to reservoir nutrient or bacteria levels; however, those in close proximity to streams and those not functioning properly may contribute nutrients and bacteria that may result in observed water quality impairments in the

June 2003 6-8 Historical Data Review for Sam Rayburn Reservoir reservoir.

June 2003 6-9 Historical Data Review for Sam Rayburn Reservoir

# ## # ##### # # ## # ## # ## # ### # ## # #### # # ## ## # ## ### # # # # ## ## # # # # # # ## ## # # ### ### # ## # ## ## # # ## # ##### # # #### ## # # # # ## ## # ##

# On-Site Sewage Facility County Boundary River or Stream Basin Reservoir

Figure 6-2. Location of GPS located OSSFs in the Sam Rayburn Reservoir watershed

June 2003 6-10 Historical Data Review for Sam Rayburn Reservoir

6.2 Point Sources

6.2.1 Permitted Facility Overview

Texas Pollutant Discharge Elimination System (TPDES) facilities were identified to characterize the contributing point sources in the Sam Rayburn Reservoir watershed. Locations of TPDES facilities, permit limits, and discharge monitoring data were obtained from TCEQ. Attribute data for point source facilities contributing to segments 0610, 0611, 0612, and 0613 are found in Table 6-5. There are no permitted facilities in the Angelina River/Sam Rayburn Reservoir (segment 0615) watershed. Additionally, no confined animal feeding operations (CAFO) are located in any of the five segments. Figure 6-3 presents the locations of the point source facilities in the Sam Rayburn Reservoir watershed.

There are currently 19 point source facilities discharging into the Sam Rayburn Reservoir (segment 0610). One of the permitted facilities is classified as a major discharge facility, while all others are classified as minor discharge facilities. Most of the point sources located in segment 0610 are corporations or government facilities.

Twenty point source facilities discharge into the Angelina River above Sam Rayburn Reservoir (segment 0611). Six of these point source sites are classified as major discharge facilities. Segment 0611 is dominated by government point source facilities.

There are four permitted facilities discharging into Attoyac Bayou (Segment 612). All four facilities are classified as minor discharge sources. The four facilities are comprised of two independent school districts, one government facility, and a clay mine corporation.

One point source facility is permitted within Lake Tyler/Lake Tyler East (segment 0613). The facility is an independent school district, classified as a minor point source.

June 2003 6-11 Historical Data Review for Sam Rayburn Reservoir Corporation Corporation Corporation Corporation Corporation Corporation Corporation Corporation Corporation Corporation Water Supply Co. Independent School Facility Type Federal Government Municipal Government Major Minor Minor Minor Minor Minor Minor Minor Minor Minor Minor Minor Minor Minor Industrial Industrial Industrial Industrial Public Domestic Public Domestic Private Domestic Private Domestic Private Domestic Private Domestic Private Domestic Private Domestic Private Domestic Private Domestic Permit Type Jasper Jasper Sabine Sabine Sabine Sabine Angelina Angelina Angelina Angelina Angelina County Nacogodoches Nacogodoches Nacogodoches Facility Lufkin Mill Subdivision City of Pineland Logyard Facility Shirley Creek Park Caney Creek Facility Westwood Subdivision Texas Air Stream Harbor Pilgrims Pride Nacogodoches Facility Name Community Estates Trailer Park Twin Oaks Mobile Home/Oak Haven Angelina and Neches River Authority Brookeland Independent School District Temple-Inland Forest Products - Pineland Temple-Inland Forest Products - Pineland Rayburn County Municipal Utilities District TPDES TPDES0054127 TPDES0068039 TPDES0020699 TPDES0023701 TPDES0031275 TPDES0118419 TPDES0054224 TPDES0099082 TPDES0027154 TPDES0036892 TPDES0113689 TX0056154-000 TX0001643-000 EPA-Permit/ TWC Permit WQ0011620-001 WQ0000368-000 WQ0011588-001 WQ0011895-001 WQ0010788-001 WQ0011337-001 WQ0010947-001 WQ0013092-001 WQ0010249-001 WQ0001820-000 WQ0003848-000 *WQ0012263-005 *WQ0013903-001 *WQ0003759-000 Segment 610: Sam Rayburn Reservoir Table 6-5. TPDES Point Source Facilities

June 2003 6-12 Historical Data Review for Sam Rayburn Reservoir Partnership Partnership Corporation Corporation Corporation State Government State Government County Government Municipal Government Municipal Government Municipal Government Municipal Government Municipal Government Municipal Government Major Major Major Minor Minor Minor Minor Minor Minor Minor Minor Minor Minor Minor Industrial Industrial Industrial Industrial Public Domestic Public Domestic Public Domestic Public Domestic Public Domestic Public Domestic Public Domestic Public Domestic Private Domestic Private Domestic Angelina Cherokee Cherokee Cherokee Cherokee Cherokee Cherokee San Augustine San Augustine San Augustine San Augustine San Augustine Nacogodoches Nacogodoches State School City of Troup Canada Street City of Cushing City of Broaddus Troup Operations Double Creek Plant City of San Augustine City of San Augustine L & R Timber Co Inc. Tueco Stryker Creek SES City of New Summerfield

Cal-Tex Lumber Company Inc. Piney Woods Conservation CNT Stephen F. Austin State University Texas Department of Mental Health & Lufkin TPDES0057673 TPDES0022349 TPDES0122351 TPDES0123447 TPDES0098744 TPDES0030708 TPDES0024392 TPDES0100587 TPDES0107875 TPDES0033529 TPDES0001066 TPDES0104175 TPDES0121053 TPDES0053937 WQ0011772-001 WQ0010268-001 WQ0013161-001 WQ0010557-001 WQ0010693-001 WQ0010693-003 WQ0013585-001 WQ0010304-001 WQ0000946-000 WQ0002973-000 WQ0010437-001 *WQ0010268-002 *WQ0004251-000 *WQ0004198-000 Segment 611: Angelina River Above Sam Rayburn Reservoir Table 6-5. TPDES Point Source Facilities (cont.)

June 2003 6-13 Historical Data Review for Sam Rayburn Reservoir Corporation Corporation Corporation Private Ownership Local Government Independent School Facility Type Municipal Government Municipal Government Municipal Government Municipal Government Municipal Government Municipal Government Municipal Government Municipal Government Major Major Major Minor Minor Minor Minor Minor Minor Minor Minor Minor Minor Minor Industrial Public Domestic Public Domestic Public Domestic Public Domestic Public Domestic Public Domestic Public Domestic Public Domestic Private Domestic Private Domestic Private Domestic Private Domestic Private Domestic Permit Type Rusk Rusk Rusk Smith Smith Smith Smith Smith Smith County Nacogodoches Nacogodoches Nacogodoches Nacogodoches Nacogodoches City of Arp Treatment Plant Treatment Plant Tall Timbers STP Woodmark Utilities Garrison Clay Mine Caraban Motor Motel City of Mount Enterprise City of Tyler-Southside Plant City of Garrison Waste Water Facility Name City of Nacogdoches - Plant 2A City of New London-South Plant Chireno Independent School District City of Whitehouse - Blackhawk Creek City of Whitehouse - Quail Lane Facility City of Henderson - Southside Wastewater TPDES TPDES0055123 TPDES0067806 TPDES0052779 TPDES0122173 TPDES0087360 TPDES0054194 TPDES0047988 TPDES0072770 TPDES0095419 TPDES0101010 TPDES0098795 TPDES0117790 TPDES0076503 TPDES0118915 EPA-Permit/ TWC Permit WQ0010342-004 WQ0014027-001 WQ0010187-001 WQ0012376-001 WQ0010511-001 WQ0010653-002 WQ0011222-001 WQ0012910-001 WQ0013000-001 WQ0013168-001 WQ0003888-000 WQ0011304-001 *WQ0014283-001 *WQ0013917-001 Segment 612: Attoyac Bayou Table 6-5. TPDES Point Source Facilities (cont.)

June 2003 6-14 Historical Data Review for Sam Rayburn Reservoir Independent School Independent School Minor Minor Public Domestic Public Domestic Smith Nacogodoches . Martinville Independent School District Chapel Hill Independent School District TPDES0118354 WQ0011857-001 *WQ0014027-001 No Data Monitoring Report (DMR) information available Segment 613: Lake Tyler/Lake Tyler East Table 6-5. TPDES Point Source Facilities (cont.) *

June 2003 6-15 Historical Data Review for Sam Rayburn Reservoir

10511-001 12910-001 12376-001 11222-001 10653-002 3762-000 $T$T $T 13000-001 $T $T 3252-003 $T $T 13168-001 $T $T $T 13495-001 $T10304-001 $T2973-002 $T 10187-001 $T 2973-004 2973-006 2973-005 13585-0$T01 $T 3888-001 $T 10693-001 $T 946-000 3888-002 10693-002 $T$T $T $T 11304-001 10437-001

$T10063-005 11403-001$T

$T 10342-004 13917-001 $T 10268-001 $T 11745-001 10947-001 $T 10557-001 $T $T 3848-001 $T $T$T368 11620-001 11588-001 $T 10249-001 $T $T11772-001 1820-002 12276-001 $T $T $T$T 1820-001 11949-001 $T$T 1820-003 11111-001 $T 13092-001 11895-001 $T $T 11438-001 $T 13161-001 12263-001 10788-001

$T Point Source Facilites Reach File, Version 1 Sam Rayburn Reservoir Watershed

N 0 30 60 Miles W E

Sources: EPAs BASINS S TPDES

Figure 6-3. Location of point source facilities in the Sam Rayburn Reservoir watershed

June 2003 6-16 Historical Data Review for Sam Rayburn Reservoir

6.2.2 Permit Limits and Discharge Monitoring Report Data

Permit and Discharge Monitoring Report (DMR) data for active (standard permit type) facilities are summarized in Tables 6-1 through 6A-35 in Appendix 6 for the period January 1997 through 2002 (where available). DMR data were not available for five facilities located within segment 0610, two facilities within segment 0611, and two facilities located within segment 0612. These facilities are identified with an asterisk in Table 6-5. This period was selected in order to provide insight into current contributions from these facilities and to be consistent with the period of time used to identify impairments in the Sam Rayburn Reservoir. The following parameters are included in the tables, however, reported parameters vary with each facility.

• Discharge (day) • Fecal coliform bacteria (Fec Coli, • pH (standard units) cfu/100mL)

• Dissolved oxygen (DO, mg/L) • Chemical oxygen demand (COD, mg/L) • Total suspended solids (TSS, mg/L) • Zinc (lbs/day) • Biochemical oxygen demand - 5-day (BOD5, mg/L) • Aluminum (lbs/day, mg/L)

• Carbonaceous BOD5 (BOD Carb, • Copper (mg/L) mg/L) • Sulfate (mg/L) • Ammonia nitrogen (NH3-N, mg/L) • Total dissolved solids (TDS, mg/L) • Flow in facility (mgd) • 2, 3,7, 8 Tetrachlorodibenzo-P- • Total residual chlorine (CL2 Res, Dioxion (TCDD, ppq) mg/L) • Halogens, adsorbable organic (HAL, • Chlorination after dechlorination (De- AD, O, lbs/day) Chlor, mg/L)

High concentrations of pollutant parameters in effluent discharges can lead to poor water quality in receiving waters in concert with Texas Surface Water Quality Standards and TPDES program guidelines. Tables 6-1 through 6-35 in Appendix 6 provide information on the number of permit limit exceedances (by parameter) for each facility. Effluent data and associated permit limits will be used to determine loading values for critical parameters in support of future water quality modeling activities for these watersheds.

June 2003 6-17 Historical Data Review for Sam Rayburn Reservoir

6.2.3 Permit Limit Exceedances

Among the 35 facilities with available DMR data, three facilities had not exceeded the permit limits any monitored parameters between 1997 and July 2002. Two facilities had only exceeded a permit limit once in the five year time span. There are only seven point source facilities in the Sam Rayburm Reservoir watershed that are considered major facilities (refer to Table 6-5). There are two additional facilities that are not considered major facilities, but have average daily flows greater than 1.0 mgd according to their DMR data (Troup Operations (0104175) and Garrison Clay Mine (0117790)). All of the major facilites had exceedances of their TSS limits and some had exceedances of BOD, COD, pH, and NH3-N. In addition, Troup Operations (0104175), located in the upper portion of segment 0611, had several exceedances of its sulfate, copper, and zinc limits. Several of the minor facilities in the watershed also had a significant number of exceedances of their applicable permit limits for various pollutants. Tables 6-1 through 6-35 present the number of exceedances at each of the facilities.

June 2003 6-18 Historical Data Review for Sam Rayburn Reservoir

Appendix 6 Permit and Discharge Monitoring Data for Permitted Facilities in the Sam Rayburn Reservoir Watershed

June 2003 6-19 Historical Data Review for Sam Rayburn Reservoir

Table 6-1. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0056154 (Angelina and Neches River Authority). Data Source: TCEQ Period: January 1997-July 2002 Segment: 610

Discharge DO (mg/L) BOD5 (mg/L) pH (day)

days/month min daily avg lbs/day max min Limit (no. of 10 (2)* exceedances) N/A 4 (1) 20 (2) 31 (0)** 9 (0) 6 (0)

Max 31 7.52 31.88 14.71 8.16 7.84

Min 22 3.54 2 0.94 6.48 6.4

Mean 30.12 5.86 5.49 3.02 7.58 7.23

Count 66 66 66 66 66 66

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of 10 (7)* 0.06 (6)* exceedances) 20 (8) 31 (1)** 0.185(0)** N/A 4 (2) 1 (3)

Max 55.4 64.3 0.150136 0.755 5 1.6

Min 1.6 0.8 0.01542 0.044 1.8 0.2

Mean 11.08 6.93 0.078 0.219 3.65 1.19

Count 66 66 66 66 66 66 *Limits range from 1997-September 1998. **Limits range from October 1998-2002.

June 2003 6-20 Historical Data Review for Sam Rayburn Reservoir

Table 6-2. TPDES Permit Limits and Discharge Monitoring Data for TX 0001643-000 (Lufkin Mill). Data Source: TCEQ Period: January 1997-July 2002 Segment: 610 Discharge Fec Coli pH BOD5 (lbs/day) (day) (#/100 mL) days/month max min daily avg daily max daily avg Limit (no. of exceedances) N/A 9 (1) 6 (2) 2900 (0) 5400 (3) N/A

Max 31 9.05 9.05 2811 6243 120

Min 0 6.55 6.19 475 868 1.1

Mean 22.03 7.47 7.09 1761.46 3187.23 18.75

Count 157 167 167 65 66 20

TSS (lbs/day) Zinc (lbs/day) Aluminum (lbs/day)

daily avg daily max daily avg daily max daily avg daily max Limit (no. of exceedances) 6670 (0) 10095 (3) N/A N/A N/A N/A

Max 5589 12711 43.171 26.238 900.57 1652.32

Min 819 1421 0 0 111.24 265.35

Mean 2426.37 4937.79 5.74 8.46 490.22 657.95

Count 66 66 66 66 66 66

HAL, AD, O Flow (mgd) TCDD (ppq) COD (mg/L) (lbs/day) daily avg daily max daily avg daily max daily max daily max Limit (no. of exceedances) 20 (0) 22 (0) 10 (0) 28.9 (0) N/A 200 (4)

Max 16.7 20.34 10 10 4151.651 1141

Min 0.127 5.489 10 10 98.121 0

Mean 10.11 11.55 10 10 2389.77 108.47

Count 66 66 20 22 22 112

Table 6-3. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0054127 (Twin Oaks Mobile Home).

June 2003 6-21 Historical Data Review for Sam Rayburn Reservoir

Data Source: TCEQ Period: January 1997-July 2002 Segment: 610 Discharge DO (mg/L) BOD5 (mg/L) pH (day)

days/month min daily avg lbs/day max min Limit (no. of exceedances) 4 (12) 10 (6) 4.2 (1) 9 (1) 6 (0)

Max 31 6.16 41.14 6.77 9.69 7.54

Min 20 0 1.42 0 7.17 6

Mean 26.19 3.76 7.84 0.569 7.76 6.96

Count 36 36 36 36 36 36

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 15 (9) 6.3 (0) 0.05 (1) 4 (4) 1 (11)

Max 32.5 4 0.1495 0.3212 5.8 1.4

Min 1.3 0 0.000203 0.001774 1.6 0

Mean 10.63 0.717 0.012 0.048 3.2 0.881

Count 36 36 36 36 36 36

June 2003 6-22 Historical Data Review for Sam Rayburn Reservoir

Table 6-4. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0068039 (Texas Air Stream Harbor). Data Source: TCEQ Period: January 1997-July 2002 Segment: 610 Discharge DO (mg/L) BOD5 (mg/L) pH (day) days/month min daily avg lbs/day max min Limit (no. of exceedances) N/A 4 (2) 10 (0) 0.83 (2) 9 (2) 6 (0)

Max 31 8.1 9.35 1.02 9.1 8.8

Min 21 2.9 1.49 0.03 0.86 7.2

Mean 30.08 6.34 5.14 0.197 8.34 7.96

Count 37 37 37 37 37 37

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 15 (2) 1.3 (0) 0.1 (0) N/A 4 (0) 1 (0)

Max 28 0.9 0.0326 0.0189 4 1.6

Min 0.9 0 0.0011 0.0007 2 1

Mean 7.8 0.238 0.005 0.007 2.43 1.11

Count 37 37 37 37 37 37

June 2003 6-23 Historical Data Review for Sam Rayburn Reservoir

Table 6-5. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0023701 (Rayburn County Municipal Utilities District). Data Source: TCEQ Period: January 1997-July 2002 Segment: 610 Discharge DO (mg/L) BOD5 (mg/L) pH (day)

days/month min daily avg lbs/day max min Limit (no. of exceedances) N/A 4 (0) 10 (1) 25 (1) 9 (0) 6 (0)

Max 31 9.7 14.57 105.54 8.5 7.5

Min 28 4.5 1.5 1.28 6.7 6

Mean 30.35 7.76 3.77 6.61 7.66 7.06

Count 52 52 52 52 52 52

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 15 (6) 38 (9) 0.3 (2) N/A 4 (8) 1 (16)

Max 83.8 668.2 0.3484 1.1508 5 1.6

Min 2 1.3 0.09397 0.1203 2.7 0

Mean 9.18 29.61 0.163 0.42 3.89 0.932

Count 52 52 52 16 52 52

June 2003 6-24 Historical Data Review for Sam Rayburn Reservoir

Table 6-6. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0031275 (Westwood Subdivision). Data Source: TCEQ Period: January 1997-July 2002 Segment: 610 Discharge DO (mg/L) BOD5 (mg/L) pH (day) day/month min daily avg lbs/day max min Limit (no. of exceedances) N/A 4 (0) 10 (2) 1.7 (1) 9 (0) 6 (1)

Max 31 9.1 26.7 2.23 7.7 7.7

Min 28 4 0.15 0.02 6.1 5.34

Mean 30.44 6.44 5.41 0.394 6.76 6.56

Count 59 59 59 59 59 59

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 15 (28) 2.5 (7) 0.02 (4) N/A 4 (5) 1 (3)

Max 54 6.6 0.0568 0.25 5 1.8

Min 5.2 0 0.000477 0.0038 1.7 0.7

Mean 17.31 1.19 0.009 0.03 2.6 1.26

Count 59 59 59 59 59 59

June 2003 6-25 Historical Data Review for Sam Rayburn Reservoir

Table 6-7. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0054224 (Shirley Creek Park). Data Source: TCEQ Period: January 1997-December 1999 Segment: 610 Discharge DO (mg/L) BOD5 (mg/L) pH (day) days/month min daily avg lbs/day max min Limit (no. of exceedances) N/A 4 (12) 10 (8) 0.48 (2) 9 (0) 6 (4)

Max 31 6.4 56.29 6.94 8.96 8.96

Min 14 0 2.25 0 4.6 4.1

Mean 23.89 4.2 8.26 0.303 7.62 6.98

Count 36 36 35 35 35 35

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 15 (10) 0.7 (2) 0.006 (0) N/A 4 (1) 1 (5)

Max 49.1 40 0.0006 0.0089 4.4 1.8

Min 3.4 0 0 0.0001 0 0

Mean 14.67 1.29 0.00015 0.0015 3.04 1.14

Count 35 35 36 36 36 36

June 2003 6-26 Historical Data Review for Sam Rayburn Reservoir

Table 6-8. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0099082 (Brookeland Independent School District). Data Source: TCEQ Period: January 1997-July 2002 Segment: 610 Discharge DO (mg/L) BOD5 (mg/L) pH (day)

days/month min daily avg lbs/day max min Limit (no. of exceedances) N/A 4 (1) 10 (0) 0.33 (0) 9 (0) 6 (0)

Max 23 7 9 0.19 7.7 7.3

Min 0 4 2 0.04 6.8 6.3

Mean 15.03 4.51 5.42 0.111 7.3 6.87

Count 37 31 31 31 31 31

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 15 (0) 0.5 (0) 0.004 (0) N/A 4 (0) 1 (0)

Max 15 0.3 0.0024 0.026 3.8 2.5

Min 2.5 0.1 0.0024 0.0026 1 1

Mean 9.25 0.194 0.0024 0.003 2.44 1.76

Count 31 31 31 31 31 31

June 2003 6-27 Historical Data Review for Sam Rayburn Reservoir

Table 6-9. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0027154 (City of Pineland). Data Source: TCEQ Period: January 1997-July 2002 Segment: 610 Discharge DO (mg/L) pH TSS (mg/L) (day) days/month min max min daily avg lbs/day Limit (no. of exceedances) N/A 4 (0) 9 (0) 6 (0) 15 (3) 27 (3)

Max 31 8.8 7.8 7.5 22.5 76.2

Min 0 4 7.3 6.7 1 0.6

Mean 58.84 7.54 7.43 7.17 5.15 7.87

Count 55 53 53 53 53 53

NH3-N (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 3 (8) 5.4 (1) 0.214 (3) N/A 4 (0) 1 (0)

Max 6.2 8.9 0.232 0.872 3.7 2.4

Min 0.043 0.07 0 0.1 2 1

Mean 1.18 1.24 0.118 0.38 2.71 1.81

Count 53 53 76 53 53 53

Fec Coli BOD Carb (mg/L) BOD5* (#/100 mL)* daily avg lbs/day lbs/day daily avg Limit (no. of exceedances) 10 (0) N/A 20 (0) 200 (0)

Max 8.3 12.7 3.9 89

Min 1.3 0.82 0 0

Mean 3.43 3.92 2.26 13.64

Count 53 17 11 11 *Data available for these parameters range from August 2000-September 2001

June 2003 6-28 Historical Data Review for Sam Rayburn Reservoir

Table 6-10. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0036892 (Temple-inland Forest Products Pineland Facility). Data Source: TCEQ Period: January 1997-July 2002 Segment: 610 Discharge DO (mg/L) pH BOD5 (mg/L) (day) days month min max min daily avg daily max Limit (no. of exceedances) N/A 4 (0) 9 (0) 6 (2) 30 (0) 60 (1)

Max 31 8.9 8.85 8.09 28 64

Min 0 4 6.35 5.91 4 6

Mean 10.68 6.4 7.37 7 10.73 19.9

Count 144 40 110 111 40 40

COD (mg/L) Copper (mg/L) Fec Coli (#/100 mL)

daily avg max daily avg daily max daily avg daily max Limit (no. of exceedances) 250 (11) 350 (11) 0.012 (10) 0.026 (6) N/A N/A

Max 356 6950 1 1 20356 610000

Min 57 7 0 0.001 400 10

Mean 193.03 247.28 0.019 0.023 8464.86 65681.5

Count 35 85 76 76 14 14

Flow (mgd) TDS (mg/L)

daily avg daily max max Limit (no. of exceedances) N/A N/A 1200 (3)

Max 5.28 13.22 1405

Min 0.00037 0.00037 9

Mean 0.578 1.11 924.43

Count 112 111 14

June 2003 6-29 Historical Data Review for Sam Rayburn Reservoir

Table 6-11. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0036892 (Temple-inland Forest Products Pineland Logyard Facility). Data Source: TCEQ Period: January 1997-July 2002 Segment: 610 Discharge COD (mg/L) pH Flow (mgd) (day) days/month max max min daily avg daily max Limit (no. of exceedances) N/A 300 (0) 9 (0) 6 (0) N/A N/A

Max 30 142.9 7.8 7.8 2.1625 2.895

Min 0 26 6.72 6.72 0.001026 0.001154

Mean 0.811 68.36 7.33 7.29 0.998 1.21

Count 54 7 7 7 7 7

June 2003 6-30 Historical Data Review for Sam Rayburn Reservoir

Table 6-12. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0057673 (City of Broaddus). Data Source: TCEQ Period: January 1997-December 1999 Segment: 610 Discharge DO (mg/L) pH BOD5 (mg/L) (day) days/month min max min daily avg lbs/day Limit (no. of exceedances) N/A 4 (3) 9 (0) 6 (1) 10 (6) 11 (0)

Max 31 10.5 8.2 8 14.62 6.2

Min 20 3.4 0 0 0 0

Mean 27.03 5.72 7.67 7.43 5.25 1.07

Count 33 33 33 33 31 31

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 15 (6) 17 (0) 0.135 (0) N/A 4 (0) 1 (1)

Max 34 15.2 0.075 0.13 4 2.6

Min 0 0 0.000418 0 1.97 0.92

Mean 7.71 1.67 0.021 0.028 3.08 1.6

Count 31 31 34 34 34 34

June 2003 6-31 Historical Data Review for Sam Rayburn Reservoir

Table 6-13. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0022349 (City of San Augustine). Data Source: TCEQ Period: January 1997-December 1999 Segment: 610 Discharge DO (mg/L) pH Flow (mgd) (day) days/month min max min daily avg daily max Limit (no. of exceedances) N/A 4 (1) 9 (0) 6 (2) 0.9 (0) N/A

Max 31 6.7 7.96 6.8 0.889 2.31

Min 28 3.9 6.6 5.1 0.0157 0.087

Mean 30.4 4.29 7.08 6.38 0.471 1.27

Count 35 35 35 35 35 35

NH3-N (mg/L) TSS (mg/L)

daily avg daily max lbs/day daily avg daily max lbs/day Limit (no. of exceedances) 3 (8) 10 (4) 23 (2) 15 (4) 40 (1) 113 (4)

Max 5.7 21.9 90.15 31.7 81.3 222.7

Min 0.06 0.086 0.361 2.4 3.7 4.2

Mean 1.91 4.32 10.23 8.56 15.83 48.97

Count 35 35 35 35 35 35

CL2 Res (mg/L) BOD Carb (mg/L)

max min daily avg daily max lbs/day Limit (no. of exceedances) 4 (1) 1 (0) 10 (0) 25 (0) 75 (0)

Max 5 1.5 5.05 13.5 42.69

Min 3.2 1 2.07 2.07 2.25

Mean 3.65 1.05 2.74 3.93 15.86

Count 35 35 35 35 35 Table 6-14. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0098744 (Stephen F. Austin University).

June 2003 6-32 Historical Data Review for Sam Rayburn Reservoir

Data Source: TCEQ Period: January 1997-December 1999 Segment: 610 Discharge DO (mg/L) BOD5 (mg/L) pH (day) days month min daily avg lbs/day max min Limit (no. of exceedances) N/A 4 (0) 10 (4) 1.7 (0) 9 (0) 6 (0)

Max 18 4 62 1.04 8.3 8.1

Min 0 4 0.13 0 6.9 6.8

Mean 6.81 4 8.65 0.125 7.8 7.23

Count 36 25 25 25 25 25

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 15 (6) 2.5 (0) 0.2 (1) N/A 4 (1) 1 (0)

Max 60 1 0.575 0.0006 4.2 3.6

Min 0.3 0 0.000021 0.0006 2.6 2

Mean 11.24 0.144 0.023 0.0006 3.3 2.728

Count 25 25 25 25 25 25

June 2003 6-33 Historical Data Review for Sam Rayburn Reservoir

Table 6-15. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0030708 (Texas Department of Mental Health & Lufkin State School). Data Source: TCEQ Period: January 1997-December 1999 Segment: 611 Discharge DO (mg/L) pH BOD5 (mg/L) (day)

days/month min max min daily avg lbs/day Limit (no. of exceedances) N/A 5 (0) 9 (0) 6 (0) 20 (0) 33 (0)

Max 31 6.2 8.88 7.18 10.4 11.89

Min 28 5 7.61 6.47 2.12 2.11

Mean 30.42 5.63 8.08 6.97 4.93 4.87

Count 36 36 36 36 36 36

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 20 (0) 33 (0) 0.2 (0) N/A 4 (1) 1 (0)

Max 16.1 23.8 0.123 0.388 4.7 2.3

Min 2.2 1.9 0.052 0.1004 1.6 1

Mean 8.28 8.4 0.091 0.17 3.12 1.32

Count 36 36 36 36 36 36

June 2003 6-34 Historical Data Review for Sam Rayburn Reservoir

Table 6-16. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0024392 (Canada Street). Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge DO (mg/L) BOD5 (mg/L) pH (day) days/month min daily avg daily max lbs/day max min Limit (no. of 4 (0)* exceedances) N/A 6 (0) 10 (10) 25 (0) 125 (3) 9 (0) 6 (1)

Max 31 7.1 18.2 22.9 166.2 8.46 7.1

Min 28 4 2 23.5 8 6.91 5.12

Mean 30.37 5.67 7.86 12.16 57.61 7.39 6.68

Count 57 57 38 38 38 57 57

TSS (mg/L) NH3-N (mg/L)

daily avg daily max lbs/day daily avg daily max lbs/day Limit (no. of 188 (0)** exceedances) 15 (1) 40 (1) 125 (0) 2 (0) 5 (0) 17 (2)

Max 17 84 126 2.58 4.81 29.4

Min 1.2 1.8 6.1 0.247 0.383 1.18

Mean 5.12 9.94 36.78 0.972 1.75 7.94

Count 57 57 57 19 19 19

De-chlor CL2 Res Flow (mgd) BOD Carb (mg/L) (mg/L) (mg/L) daily avg daily max max min daily avg daily max lbs/day Limit (no. of exceedances) 1.5 (0) N/A 0.1 (1) 1 (0) 10 (0) 25 (0) 83 (2)

Max 1.42 3.65 2.3 1.6 9.56 16.1 94.3

Min 0.12 0.041 0.02 1 2.43 3.6 9.8

Mean 0.611 1.1 0.11 1.05 5.43 9.11 39.09

Count 57 57 57 57 19 19 19 *Limits for DO (mg/L) shift between 4 and 6 multiple times from 1997- 2002 **Limits range from April 1997-March 2000 and April 2000 and September 2002, respectively Table 6-17. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0100587 (Double Creek Plant).

June 2003 6-35 Historical Data Review for Sam Rayburn Reservoir

Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge DO (mg/L) pH BOD5 (mg/L) (day) days month min max min daily avg daily max lbs/day Limit (no. of 4 (0)* exceedances) N/A 6(3) 9 (0) 6 (0) 10 (0) 25 (0) 146 (0)

Max 31 7.3 7.92 7.24 5.5 16.2 116

Min 28 3.17 7.15 6.45 1.5 2.28 24

Mean 30.41 5.31 7.47 6.86 2.86 5.04 45.39

Count 66 66 66 66 31 31 31

TSS (mg/L) NH3-N (mg/L)

daily avg daily max lbs/day daily avg daily max lbs/day Limit (no. of exceedances) 15 (3) 40 (2) 219 (5) 2 (0) 10 (0) 29 (4)

Max 27 126 479 0.76 3.12 15.6

Min 1 1.8 14 0.072 0.153 0.98

Mean 5.02 13.22 85.93 0.234 0.645 4.17

Count 66 66 66 35 35 35

De-chlor CL2 Res Flow (mgd) BOD Carb (mg/L) (mg/L) (mg/L) daily avg daily max max min daily avg daily max lbs/day Limit (no. of exceedances) 1.75 (19) N/A 0.1 (0) 1 (0) 10 (0) 25 (1) 146 (1)

Max 3.906 5.9182 0.09 1.2 10 46 158

Min 0.01 1.491 0.06 1 1.33 1 13

Mean 1.17 2.97 0.084 1.04 3.27 6.63 54.1

Count 66 66 66 66 35 35 35 *Limits range from December 1996-July 1999 and August 1999-October 2002, respectively.

June 2003 6-36 Historical Data Review for Sam Rayburn Reservoir

Table 6-18. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0107875 (City of New Summerfield). Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge DO (mg/L) pH BOD5 (mg/L) (day) days/month min max min daily avg lbs/day Limit (no. of exceedances) N/A 4 (9) 9 (4) 6 (1) 30 (27) 15 (10)

Max 31 8.4 9.58 8.8 59.9 59.9

Min 0 0.2 8 5.1 0 1.6

Mean 29.6 4.83 8.8 8.05 32.78 11.57

Count 42 42 42 42 42 42

TSS (mg/L) Flow (mgd)

daily avg lbs/day daily avg daily max Limit (no. of exceedances) 90 (7) 45 (6) 0.06 (4) N/A

Max 141.3 75.5 0.07504 0.165

Min 11.6 1.1 0.0166 0.018

Mean 63.5 21.41 0.04 0.073

Count 42 42 42 42

June 2003 6-37 Historical Data Review for Sam Rayburn Reservoir

Table 6-19. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0033529 (City of Troup). Data Source: TCEQ Period: January 1997- October 1999 Segment: 611 Discharge DO (mg/L) pH TSS (mg/L) (day) days month min max min daily avg lbs/day Limit (no. of exceedances) N/A 4 (0) 9 (0) 6 (0) 20 (1) 51 (0)

Max 31 8 8 7.7 23.5 40.1

Min 28 5.4 7.4 6.6 2.1 3.2

Mean 30.41 6.61 7.7 7.33 8.8 13.056

Count 34 34 34 34 34 34

NH3-N (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 3 (0) 7.7 (0) 0.308 (0) N/A 4 (1) 1 (0)

Max 0.47 0.58 0.2433 0.521 10 1.9

Min 0.1 0.1 0.12 0.156 2.2 1

Mean 0.172 0.255 0.177 0.294 3.18 1.27

Count 11 11 34 34 34 34

BOD Carb (mg/L) BOD5 (mg/L)

daily avg lbs/day daily avg lbs/day Limit (no. of exceedances) 20 (0) 51 (0) 20 (0) 51 (0)

Max 3.32 5.3 3.82 6.28

Min 2.12 2.23 2 2.71

Mean 2.52 3.83 2.63 3.93

Count 11 11 23 23

June 2003 6-38 Historical Data Review for Sam Rayburn Reservoir

Table 6-20. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0001066 (Tueco Stryker Creek Ses). Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge pH Flow (mgd) TSS (mg/L) (day) days/month max min daily avg daily max daily avg max Limit (no. of exceedances) N/A 9 (1) 6 (0) 575 (0) 575 (0) 30 (1) 100 (1)

Max 31 8.9 8.2 98 560 60 178

Min 28 7.1 6.1 0.0163 0.043 1 1

Mean 30.39 7.79 7.06 18.8 166.9 4.73 9.57

Count 150 101 101 150 150 101 100

June 2003 6-39 Historical Data Review for Sam Rayburn Reservoir

Table 6-21. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0104175 (Troup Operations). Data Source: TCEQ Period: January 1997-December 1999 Segment: 611 Discharge pH TSS (mg/L) Flow (mgd) (day) days/month max min daily avg daily max daily avg daily max Limit (no. of exceedances) N/A 9 (0) 5 (8) 35 (8) 70 (10) N/A N/A

Max 12 8.9 8.2 294.8 525 2400 554.052

Min 0 5.1 5 1 1 0.024 0.024

Mean 1.1 5.99 5.59 19.02 31.57 106.56 105.07

Count 153 65 66 66 66 66 65

Sulfate (mg/L) Copper (mg/L) Zinc (mg/L)

daily avg daily max daily avg daily max daily avg daily max Limit (no. of exceedances) 600 (11) 900 (8) 0.016 (4) 0.034 (3) 0.13 (12) 0.28 (8)

Max 1280 1485 5.38 5.38 8.5 6.1

Min 11.8 22 0.005 0.005 0.0345 0.017

Mean 291.2 345.43 0.463 0.466 1.41 0.875

Count 66 66 13 13 15 15

June 2003 6-40 Historical Data Review for Sam Rayburn Reservoir

Table 6-22. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0053937 (City of Cushing). Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge DO (mg/L) pH BOD5 (mg/L) (day) days/month min max min daily avg lbs/day Limit (no. of exceedances) N/A 4 (13) 9 (48) 6 (0) 30 (18) 20 (3)

Max 31 12.2 12.02 9.6 86.6 28.8

Min 28 0.3 7.2 7 8.8 2.6

Mean 30.42 6.29 9.42 8.04 29.77 9.44

Count 60 60 60 60 60 60

TSS (mg/L) Flow (mgd)

daily avg lbs/day daily avg daily max Limit (no. of exceedances) 90 (9) 61 (3) 0.081 (0) N/A

Max 531.3 159.5 0.048 0.104

Min 13 4.2 0.024 0.036

Mean 69.22 22.29 0.038 0.042

Count 60 60 60 60

June 2003 6-41 Historical Data Review for Sam Rayburn Reservoir

Table 6-23. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0055123 (City of Nacogdoches - Plant 2a). Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge DO (mg/L) pH TSS (mg/L) (day) days/month min max min daily avg daily max lbs/day Limit (no. of exceedances) 6 (3) 9 (0) 6 (0) 15 (0) 40 (9) 1611 (0)

Max 31 8.09 7.99 7.4 11.5 129 710

Min 28 5.48 7.21 6.49 1.1 1.6 35

Mean 30.43 6.89 7.56 6.91 4.27 22.22 204.22

Count 56 56 56 56 56 56 56

NH3-N (mg/L) Copper (mg/L)

daily avg daily max lbs/day daily avg daily max lbs/day Limit (no. of exceedances) 2 (10) 10 (6) 215 (0) 0.02 (1) 0.043 (2) 2.15 (0)

Max 8.07 15.8 156.65 0.111 0.426 3

Min 0.107 0.0345 2.079 0 0 0

Mean 0.968 3.77 31.61 0.005 0.015 0.319

Count 56 56 56 56 56 36

De-chlor CL2 Res Flow (mgd) BOD Carb (mg/L) (mg/L) (mg/L) daily avg daily max max min daily avg daily max lbs/day Limit (no. of exceedances) 12.88 (0) 0.1 (1) 1 (2) 10 (0) 25 (3) 1074 (0)

Max 8.779 22.08 1.22 8 9.1 31 508

Min 0.016 4.45 0 0.9 1.2 2.1 42

Mean 2.37 9.09 0.049 1.31 2.74 8.61 128.12

Count 56 56 56 56 56 56 56

June 2003 6-42 Historical Data Review for Sam Rayburn Reservoir

Table 6-24. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0067806 (Caraban Motor Motel). Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge DO (mg/L) pH BOD5 (mg/L) (day) days/month min max min daily avg lbs/day Limit (no. of exceedances) N/A 4 (28) 9 (0) 6 (13) 10 (23) 1 (1)

Max 31 8.2 7.8 7.2 34.8 1.34

Min 25 0 5.4 4.1 3.86 0.01

Mean 30.27 3.01 6.93 6.15 11.2 0.187

Count 46 46 45 45 45 45

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 15 (27) 1.6 (3) 0.013 (0) N/A 4 (3) 1 (9)

Max 135 9.1 0.008 0.011 4.2 1.9

Min 5 0 0.0002 0.0004 1.2 0

Mean 23.68 0.584 0.001 0.003 3.17 1.04

Count 45 45 37 37 34 34

June 2003 6-43 Historical Data Review for Sam Rayburn Reservoir

Table 6-25. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0052779 (Southside Wastewater Treatment Plant). Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge DO (mg/L) pH TSS (mg/L) (day) days/month min max min daily avg daily max lbs/day Limit (no. of exceedances) N/A 4 (0) 9 (0) 6 (1) 20 (0) 45 (2) 334 (0)

Max 31 8 7.6 7.6 18.2 66 286.1

Min 28 4 6.1 5.7 0.6 2 8.1

Mean 30.4 6.04 6.84 6.27 4.86 11.9 62.35

Count 42 42 42 42 42 42 42

NH3-N (mg/L) Flow (mgd)

daily avg daily max lbs/day daily avg daily max Limit (no. of 10 (2)* exceedances) 3 (11) 7(3)** 50 (3) 2 (0) N/A

Max 15.12 18.7 154.664 1.788 7.886

Min 0.092 0.167 0.912 0.057 1.348

Mean 2.29 4.14 22.01 0.605 3.25

Count 42 38 42 42 42

DE-CHLO CL2 Res BOD Carb (mg/L) R (mg/L) (mg/L) max min daily avg daily max lbs/day Limit (no. of exceedances) 0.01 (3) 1 (4) 20 (1) 45 (2) 334 (1)

Max 1.8 1.6 23.55 108 533.38

Min 0.02 0 1.62 2 17.74

Mean 0.155 0.983 5.85 13.57 77.16

Count 42 42 42 42 42 *Limit ranges from July 1996-January 2000 **Limit ranges from January 2000-August 2001

June 2003 6-44 Historical Data Review for Sam Rayburn Reservoir

Table 6-26. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0087360 (City of New London). Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge DO (mg/L) pH BOD5 (mg/L) (day) days/month min max min daily avg lbs/day Limit (no. of exceedances) N/A 4 (2) 9 (0) 6 (0) 30 (3) 25(5)

Max 31 8.75 8.95 8.14 35.5 40

Min 28 2.85 7.51 7 8.5 3.47

Mean 30.41 5.25 8.07 7.64 19.06 12.55

Count 56 56 56 56 56 56

TSS (mg/L) Flow (mgd)

daily avg lbs/day daily avg daily max Limit (no. of exceedances) 90 (0) 75 (1) 0.1 (0) N/A

Max 69.6 75.6 0.0941 0.42428

Min 5.2 2.4 0.02509 0.04127

Mean 31.9 21.86 0.056 0.157

Count 56 56 56 56

June 2003 6-45 Historical Data Review for Sam Rayburn Reservoir

Table 6-27. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0054194 (City of Arp). Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge DO (mg/L) pH BOD5 (mg/L) (day) days/month min max min daily avg lbs/day Limit (no. of exceedances) N/A 2 (0) 9 (0) 6 (0) 20 (0) 35 (0)

Max 31 8.2 7.8 7.8 8.8 11.4

Min 28 3.8 6.9 6.9 2 0.6

Mean 30.44 5.6 7.36 7.36 4.22 2.72

Count 48 48 48 48 48 48

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 20 (3) 35 (2) 0.211 (1) N/A 4 (3) 1 (10)

Max 25.8 90.7 0.231 0.489 4.8 1.2

Min 1.5 0.6 0.031 0.049 2.2 0.3

Mean 9.03 8.66 0.078 0.18 3.53 0.967

Count 48 48 48 48 48 48

June 2003 6-46 Historical Data Review for Sam Rayburn Reservoir

Table 6-28. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0047988 (City of Tyler - Southside Plant). Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge DO (mg/L) pH Flow (mgd) (day) days/month min max min daily avg daily max Limit (no. of 5 (0)* exceedances) N/A 4 (0) 9 (0) 6 (0) 9 (0) N/A

Max 31 6.6 7.25 7 5.801 11.433

Min 28 5 6.42 6.15 4.087 0.74

Mean 30.39 5.74 6.98 6.48 4.9 6.28

Count 38 38 38 38 38 38

NH3-N (mg/L) TSS (mg/L)

daily avg daily max lbs/day daily avg daily max lbs/day Limit (no. of 3 (0)* 225 (0)* 1126 exceedances) 15 (0) 10 (1) (0) 15 (0) 40 (1) 1126 (0)

Max 2.9 10.6 98.6 11.4 60 598.5

Min 0.1 0.1 2.2 2.1 4 84.7

Mean 0.713 2.57 29.26 5.16 11.49 225.24

Count 38 38 38 38 38 38

De-chlor CL2 Res BOD Carb (mg/L) (mg/L) (mg/L) max min daily avg daily max lbs/day Limit (no. of exceedances) 0.1 (0) 1 (0) 10 (0) 25 (0) 751 (0)

Max 0 1.3 6.7 13.6 259.8

Min 0 1 2 2.2 73.5

Mean 0 1.04 2.7 4.62 111.54

Count 38 38 38 38 38 *Limits for these parameters shift between the listed values multiple times from 1997- 2002 Table 6-29. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0072770

June 2003 6-47 Historical Data Review for Sam Rayburn Reservoir

(City of Whitehouse - Blackhawk Creek). Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge DO (mg/L) pH Flow (mgd) (day) days/month min max min daily avg daily max Limit (no. of exceedances) N/A 6 (6) 9 (0) 6 (0) 0.68 (3) N/A

Max 31 8.2 7.84 7.3 0.809807 1058.9

Min 28 5.2 6.18 6 0.299056 0.37125

Mean 30.43 6.66 7.17 6.67 0.462 18.29

Count 60 60 60 60 60 60

NH3-N (mg/L) TSS (mg/L)

daily avg daily max lbs/day daily avg daily max lbs/day Limit (no. of exceedances) 2 (22) 10 (6) 11 (18) 15 (1) 40 (2) 85 (1)

Max 11.63 16.42 186 39 133 141.1

Min 0.026 0.084 0.095 1 1 3.6

Mean 2.19 3.96 11.37 4.93 10.28 19.34

Count 60 60 60 60 60 60

CL2 Res (mg/L) BOD Carb (mg/L)

max min daily avg daily max lbs/day Limit (no. of exceedances) 4 (4) 1 (0) 10 (1) 25 (1) 57 (1)

Max 4.8 1.7 26.71 38 90.72

Min 1.8 1 2 2 5.6

Mean 3.32 1.08 3.61 6.11 13.62

Count 60 60 60 60 60

June 2003 6-48 Historical Data Review for Sam Rayburn Reservoir

Table 6-30. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0095419 (City of Whitehouse - Quail Lane Facility). Data Source: TCEQ Period: January 1997-July 2002 Segment: 611 Discharge DO (mg/L) pH BOD5 (mg/L) (day) days/month min max min daily avg lbs/day Limit (no. of exceedances) N/A 2 (0) 9 (0) 6 (0) 20 (0) 6.9 (0)

Max 31 6.4 7.7 7.5 10.6 1.9

Min 28 2.6 7.19 6.7 2.8 0.08

Mean 30.41 3.97 7.46 7.16 5.93 0.639

Count 37 37 37 37 37 37

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 20 (0) 6.9 (0) 0.041 (0) N/A 4 (0) 1 (0)

Max 15.4 2 0.0292 0.0365 3.4 2.1

Min 1.4 0.1 0.0037 0.0076 2.2 1

Mean 4.46 0.503 0.015 0.023 2.49 1.79

Count 37 37 37 37 37 37

June 2003 6-49 Historical Data Review for Sam Rayburn Reservoir

Table 6-31. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0101010 (Tall Timbers Utilities). Data Source: TCEQ Period: January 1997-March 2000 Segment: 611 Discharge DO (mg/L) pH TSS (mg/L) (day) days/month min max min daily avg lbs/day Limit (no. of 4 (0)* exceedances) N/A 6(0) 9 (0) 6 (0) 15 (2) 31 (0)

Max 31 9.85 7.99 7.63 18.4 30.1

Min 0 6 7.43 7 3.5 4.6

Mean 29.59 7.42 7.69 7.33 7.86 11.75

Count 37 37 37 37 37 37

NH3-N (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 3 (1) 6.3 (1) 0.25 (0) N/A 4 (0) 1 (0)

Max 6.89 10.61 0.204291 0.4139 4 1.6

Min 0.03 0.06 0.1231 0.1585 1.54 1

Mean 0.999 1.55 0.168 0.218 2.39 1.12

Count 16 16 37 37 37 37

BOD Carb (mg/L) BOD5 (mg/L)**

daily avg lbs/day daily avg lbs/day Limit (no. of exceedances) 10 (0) 21 (0) 10 (1) 16 (1)

Max 4.2 6.53 21 27.2

Min 1.4 2.2 1.4 2.64

Mean 2.34 3.58 5.61 7.75

Count 16 16 21 21 *DO (mg/L) has a limit of 4 mg/L from October 1998-October 1999 and a limit of 6 mg/L from October 1996- September 1998 and October 1999-June 2002. **Data presented for BOD5 (mg/L) ranges from January 1997-September 1998

June 2003 6-50 Historical Data Review for Sam Rayburn Reservoir

Table 6-32. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0098795 (Woodmark Utilities). Data Source: TCEQ Period: January 1997- September 1999 Segment: 611 Discharge DO (mg/L) pH BOD5 (mg/L) (day) days/month min max min daily avg lbs/day Limit (no. of exceedances) 2 (0) 9 (0) 6 (0) 20 (1) 16 (0)

Max 31 3 7.9 7.9 21.5 13.98

Min 28 2.2 6.8 6.8 2 1.21

Mean 30.39 2.62 7.38 7.38 9.81 6.6

Count 33 33 33 33 25 25

TSS (mg/L) Flow (mgd)

daily avg lbs/day daily avg daily max Limit (no. of exceedances) 20 (7) 16 (2) 0.094 (0)

Max 45.5 32.3 0.089 0.089

Min 2.3 1.5 0.045 0.049

Mean 13.83 8.91 0.0748 0.077

Count 33 33 33

CL2 Res (mg/L) BOD Carb (mg/L)

max min daily avg lbs/day Limit (no. of exceedances) 4 (0) 1 (0) 20 (0) 16 (0)

Max 3.5 2.9 16.5 9.63

Min 1.9 1.5 4.3 2.3

Mean 2.65 2.12 9.53 4.89

Count 33 33 8 8

June 2003 6-51 Historical Data Review for Sam Rayburn Reservoir

Table 6-33. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0117790 (Garrison Clay Mine). Data Source: TCEQ Period: January 1997-March 2001 Segment: 612 Discharge Aluminum pH TSS (mg/L) Flow (mgd) (day) (mg/L) days/month max min daily max daily avg daily avg daily max Limit (no. of exceedances) N/A 9 (0) 6 (0) 60 (7) N/A N/A N/A

Max 10 8.97 8.97 112 16.6 6800 54000

Min 0 6.7 6.7 4 0.01 0.296 0.403

Mean 1.31 7.7 7.67 30.36 2.77 327.71 2158.36

Count 93 36 36 36 36 33 33

June 2003 6-52 Historical Data Review for Sam Rayburn Reservoir

Table 6-34. TPDES Permit Limits and Discharge Monitoring Data for TPDES 0076503 (City of Garrison Wwtp). Data Source: TCEQ Period: January 1997-July 2002 Segment: 612 Discharge DO (mg/L) pH BOD5 (mg/L) (day) days/month min max min daily avg lbs/day Limit (no. of exceedances) N/A 4 (35) 9 (1) 6 (2) 30 (14) 30 (3)

Max 31 5.89 9.45 8.68 50.3 36.49

Min 0 2.29 6.71 5.37 2.68 1.64

Mean 22.52 3.76 7.67 7.05 20.61 15.58

Count 65 67 67 67 67 67

TSS (mg/L) Flow (mgd) CL2 Res (mg/L)

daily avg lbs/day daily avg daily max max min Limit (no. of exceedances) 90 (0) 90 (0) 0.12 (0) N/A 4 (3) 1 (31)

Max 71.9 55.6 0.117 0.842 5 2

Min 3.3 2.3 0.072 0.084 1.3 0.01

Mean 16.5 12.07 0.084 0.125 2.73 0.95

Count 67 67 67 67 67 67

June 2003 6-53 Historical Data Review for Sam Rayburn Reservoir

Table 6-35. Permit Limits and Discharge Monitoring Data for WQ0011857-001 (Chapel Hill Independent School District). Data Source: TCEQ Period: January 1997-July 2002 Segment: 613 Total Total Nitrogen Potassium pH Phosphorus Conductivity (mg/kg) (mg/kg) (mg/kg) max ind grab ind grab ind grab max Limit (no. of exceedances) 9 (0) N/A N/A N/A N/A

Max 7.2 935 290 650 250

Min 4.9 42.1 26.9 140 56

Mean 6.13 344.85 142.84 377.27 151.94

Count 11 11 11 11 11

June 2003 6-54 Historical Data Review for Sam Rayburn Reservoir

7.0 Preliminary Model Selection

Segments of the Sam Rayburn Reservoir (0610 and 0615) are on the 2000 Texas section 303(d) list due to impairments by depressed dissolved oxygen, pH, aluminum, and other constituents of concern. The objective of this section is to present a potential modeling approach capable of meeting TMDL development needs for Sam Rayburn Reservoir. This document presents selection criteria, modeling options, and the preliminary proposed modeling approach. The modeling approach presented is based on review of the data available for the watershed and reservoir data. Future phases of this project may indicate that modifications of the proposed approach are necessary.

7.1 Selection Criteria

In selecting an appropriate modeling platform for Sam Rayburn Reservoir TMDL development, the following criteria have been considered and addressed (expanding on classification of Mao, 1992):

• Technical Criteria • Regulatory Criteria • User Criteria

Technical criteria refer to the model’s simulation of the physical system in question, including watershed and/or stream characteristics/processes and constituents of interest. Regulatory criteria make up the constraints imposed by regulations, such as water quality standards or procedural protocol. User criteria comprise the operational or economical constraints imposed by the end-user and include factors such as hardware/software compatibility and financial resources. The following discussion details considerations within each of these categories specific to Sam Rayburn Reservoir.

7.1.1 Technical Criteria

7.1.1.1 Physical Domain

Representation of the physical domain is perhaps the most important consideration in selecting a model. The physical domain refers to the focus of the modeling effort - typically either the receiving water itself or a combination of the contributing watershed and the receiving water. Selection of the appropriate modeling domain depends on the constituents of interest and the conditions under which the waterbody exhibits impairment. For a waterbody dominated by point source inputs that exhibits impairments under only low-flow conditions, a steady-state approach is typically undertaken. This type of modeling approach focuses only on in-stream (receiving water) processes during a user- specified condition, such as 7Q2 flow.

For waterbodies impacted additionally or solely by nonpoint sources or primarily rainfall-driven flow and pollutant contributions, a dynamic approach is recommended. Dynamic watershed models consider time-variable nonpoint source contributions from a watershed surface or subsurface. Some models consider monthly or seasonal variability while others enable assessment of conditions immediately before, during, and after individual rainfall events. A dynamic receiving water model is recommended for Sam Rayburn Reservoir due to the considerable variability in hydrodynamic and water quality conditions it exhibits throughout the year and from one year to the next. The necessity for a dynamic watershed component will be addressed later in this section.

June 2003 7-1 Historical Data Review for Sam Rayburn Reservoir

7.1.1.2 Critical Conditions

The goal of the TMDL is to determine the assimilative capacity of a waterbody and to identify potential allocation scenarios that enable the waterbody to achieve water quality criteria under all conditions. The critical condition is the set of environmental conditions for which controls designed to protect water quality will ensure attainment of objectives for all other conditions. This is typically the period of time in which the stream exhibits the most vulnerability.

Based on a review of the available data, critical conditions for dissolved oxygen in Sam Rayburn Reservoir occur mostly in late spring, summer, and early fall (refer to Appendices 4B and 4D). The lowest dissolved oxygen was observed in Sam Rayburn Reservoir during late summer in the hypolimnion.

With the critical period being from mid-summer to late-fall, it’s possible that DO levels are depressed due to any of a number of reasons:

• point source contributions (facilities are identified in Section 6.2) • excessive growth of algae or aquatic vegetation • contributions from nonpoint sources that cumulatively impact the reservoir • internal recycling of nutrients (release and settling from bottom sediments) • a combination of the above in conjunction with specific climatic conditions

7.1.1.3 Constituents

Another important consideration in model selection and application is choosing appropriate constituents to simulate. Choice of state variables is a critical part of model implementation. The more state variables included, the more difficult the model will be to implement and calibrate. However, if key state variables are omitted from the simulation, the model may not simulate all necessary aspects of the system and may produce unrealistic results. A delicate balance must be met between minimal constituent simulation and maximum applicability.

While it is desirable to model only state variables for which data are available, this is not always appropriate when unmonitored components are essential to the understanding of key state variables. For instance, both dissolved and particulate phases must generally be included. Simulation models have differing abilities to represent types of constituents. Distinctions may include conservative vs. degrading, dissolved vs. sediment sorbed, and organic vs. inorganic constituents.

The focus of TMDL development for Sam Rayburn Reservoir is on DO and possibly metals, although additional monitoring will be necessary to confirm metals impairments. Reservoir DO dynamics can be extremely complex, and accurate estimation of DO levels relies on a host of interrelated factors. DO in the water column may be influenced by reaeration, oxidation of carbonaceous and nitrogenous materials, aquatic life respiration, algae and plant productivity, and oxygen demand exerted by sediments. Each of these components is impacted by numerous additional factors, such as temperature, light availability, salinity, and contributions of nutrients and biochemical oxygen demand from point and nonpoint sources.

June 2003 7-2 Historical Data Review for Sam Rayburn Reservoir

Based on a review of the available data, some preliminary conclusions can be made regarding DO dynamics in the impaired waterbody:

• Depth profile data indicate that dissolved oxygen stratification occurs during summer months, resulting in hypolimnetic oxygen deficits. • Nutrient concentrations (nitrogen and phosphorus) were often very high when compared to the nutrient screening levels and EPA nutrient reference criteria under all conditions (Section 4.0). This may indicate that storm washoff as well as agricultural infiltration and septic systems impact the reservoir.

7.1.1.4 Source Contributions

Primary sources of pollution to a waterbody must be considered in the model selection process. Accurately representing contributions from permitted point sources and nonpoint source contributions from urban, agricultural, and natural areas is critical in properly representing the system and ultimately evaluating potential load reduction scenarios. Likely contributors have been identified in Section 6.0 of this document.

Sam Rayburn Reservoir and many of its tributaries receive contributions from 44 permitted facilities and a range of nonpoint sources. The Sam Rayburn Reservoir watershed is composed of predominantly forest land, although there are pockets of pasture, cropland, and silviculture throughout the watershed as well as small populated areas. These types of landuses have potential to contribute significant amounts of carbonaceous and nitrogenous materials that may have a detrimental impact on reservoir DO levels. There are clearly a number of stressors in the Sam Rayburn Reservoir watershed that can detrimentally impact DO concentrations.

Also multiple nonpoint and point sources are likely impacting the level of metals, therefore the modeling platform must be able to account for their contributions and represent key processes. For example, aluminum contributions from natural background/geological conditions or bentonite/clay mining operations impact the stream under different conditions and in a different manner than those from a permitted facility, such as a paper mill.

7.1.2 Regulatory Criteria

A properly designed and applied model provides the source-response linkage component of the TMDL and enables accurate assimilative capacity assessment and allocation proposition. A waterbody’s assimilative capacity is determined through adherence to predefined water quality criteria. Texas Surface Water Quality Standards define applicable dissolved oxygen and metals criteria for Sam Rayburn Reservoir (Section 1.3). These criteria are the target for TMDL modeling exercises. Therefore, the proposed modeling platform must enable direct comparison of model results to both daily mean and minimum oxygen values and other listed constituents such as metals.

June 2003 7-3 Historical Data Review for Sam Rayburn Reservoir

7.1.3 User Criteria

User criteria are determined by the needs, expectations, and resources of TCEQ and the Sam Rayburn Reservoir stakeholders. A number of these criteria are defined in TCEQ’s TMDL guidance document, including compatibility with TCEQ platforms and funding resource availability (TNRCC, 1999). Modeling software must be compatible with existing TNRCC UNIX- or personal-computer-based hardware platforms and due to future use for planning and permitting decisions should be well-documented, tested, and accepted. From a resource perspective, the level of effort required to develop, calibrate, and apply the model must be commensurate with available funding, without compromising the ability to meet technical criteria. In addition to these primary criteria, the required time-frame for model development, application, and completion is important, as well as the level of concern or priority of the impaired stream.

7.2 Proposed Modeling Approach

The technical, regulatory, and user criteria identified in the previous section of the report helped to narrow the field of appropriate models. The following discussion recommends one general approach with a number of available modeling options, as well as general data needs to support model development, calibration, and verification in both cases.

7.2.1 Proposed Approach

Model application and TMDL development for Sam Rayburn Reservoir will likely require combination of a watershed loading model and a reservoir model. This preliminary assessment is based on review of available data and the technical criteria defined above. A watershed component is necessary to simulate the dynamic contribution of nonpoint source oxygen- impacting contributions as well as metals and other constituents of concern. This will support evaluation of the impact of different sources, differentiation between natural and anthropogenic contributions, and testing implementation scenarios for watershed management. Lead candidates for the watershed modeling component include two models of variable complexity:

• Loading Simulation Program in C++ (LSPC) - a GIS-based watershed assesssment, analysis, and TMDL development system with similar capabilities as the Hydrologic Simulation Program in FORTRAN (HSPF). • Generalized Watershed Laoding Function (GWLF) - a simplified watershed hydrologic and water quality model (that primarily supports nutrient and sediment analyses). Metal analysis would require a separate model or analytical method.

A dynamic reservoir modeling component is necessary to evaluate the response of the reservoir to dynamic loadings from point and nonpoint sources, including potential in-reservoir sources such as sediment oxygen demand. It will receive time-variable outputs (flow and pollutant loads) directly from the watershed model. With the variability in impairment locations exhibited by the reservoir (e.g., aluminum and pH impairments that tend to be in isolated regions of the reservoir), it’s expected that a multi-dimensional model will need to be applied. A two- (2D) or three- dimensional (3D) model will permit evaluation of vertical or lateral variability in the reservoir, as is exhibited in available monitoring data. Lead candidates for the reservoir modeling component are:

June 2003 7-4 Historical Data Review for Sam Rayburn Reservoir

• Environmental Fluid Dynamics Code (EFDC) - a dynamic 2D/3D model capable of simulating temperature stratification, complex transport, and water quality processes including eutrophication and sediment diagenesis in reservoir systems and • CE-QUAL-W2 - a dynamic 2D model that simulates hydrodynamics and water quality processes . CE-QUAL-W2 does not explicitly simulate aluminum, however, model results can be used to support additional analyses.

Regardless of the specific models selected, the same general approach will apply for any combination of the watershed and reservoir models. Therefore, since there is potential for application to more parameters than DO, the following discussion presents linkage of the two more complex and comprehensive models (LSPC and EFDC)

7.2.2 LSPC

LSPC is proposed for simulation of watershed processes, including hydrology and pollutant accumulation and washoff. LSPC is a re-coded version of EPA’s HSPF that has been developed through a joint effort between EPA and Tetra Tech, Inc. and offers a number of advantages over HSPF (Bicknell et al., 1996). The program is non-proprietary, supported by EPA, and will be one of the core models in the next generation modeling toolbox being developed by EPA Region 4. It integrates a geographical information system (GIS), comprehensive data storage and management capabilities, dynamic watershed model algorithms (HSPF), and a data analysis/post-processing system into a convenient PC-based windows interface that dictates no software requirements. Direct linkages are also available to the EFDC, an advanced 1-, 2-, or 3-D hydrodynamic and water quality model, which is proposed for simulation of reservoir processes for Sam Rayburn Reservoir (Hamrick, 1996).

Application of the watershed modeling component will entail subdivision of upstream tributaries into smaller subwatersheds with distinct hydrologic components. Each of these subwatersheds will be represented by a suite of parameters that characterize hydrology and water quality constituent loading characteristics. Hydrologic parameters will be based primarily on soil and landuse characteristics and will define the amount of surface runoff, infiltration, interflow, and groundwater flow occurring. Water quality constituent characteristics will additionally vary by landuse. These characteristics will define the loading of primary parameters that impact in-stream DO, such as nitrogen, phosphorus, BOD, and total suspended solids/sediment. If required the model can also simulate metals. Using continuous observed rainfall and meteorological data from stations identified during the data review as the driver, the model will estimate flow and water quality characteristics (loadings and/or concentrations) on a time-variable basis.

7.2.3 EFDC

Flow and water quality characteristics from LSPC will, in turn, be applied directly to the EFDC receiving water model. EFDC is a comprehensive 1-, 2-, or 3-dimensional model capable of simulating hydrodynamics, salinity, temperature, suspended sediment, water quality, algae, and the fate of toxic materials. The model uses stretched or sigma vertical coordinates and Cartesian or curvilinear, orthogonal horizontal coordinates to represent the physical characteristics of a waterbody. The hydrodynamic portion of the model solves three-dimensional, vertically hydrostatic, free surface, turbulent averaged equations of motion for a variable-density fluid. Dynamically-coupled transport

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equations for turbulent kinetic energy, turbulent length scale, salinity and temperature are also solved. The EFDC model also simultaneously solves an arbitrary number of Eulerian transport-transformation equations for dissolved and suspended materials. The EFDC model allows for drying and wetting in shallow areas by a mass conservation scheme. The physics of the EFDC model and many aspects of the computational scheme are equivalent to the widely used Blumberg-Mellor model (Blumberg & Mellor, 1987) and U. S. Army Corps of Engineers' Chesapeake Bay model (Johnson, et al, 1993).

The water quality portion of the model simulates the spatial and temporal distributions of 22 water quality parameters including dissolved oxygen, suspended algae (3 groups),attached algae, various components of carbon, nitrogen, phosphorus and silica cycles, and fecal coliform bacteria. Salinity, water temperature, and total suspended solids are needed for computation of the twenty-two state variables, and they are provided by the hydrodynamic model. The kinetic processes included in this model use the Chesapeake Bay three-dimensional water quality model, CE-QUAL.ICM (Cerco & Cole, 1994).

A sediment process model with 27 state variable is also included in the EFDC model. It uses a slightly modified version of the Chesapeake Bay three-dimensional model (DiToro & Fitzpatrick, 1993). The sediment process model, upon receiving the particulate organic matter deposited from the overlying water column, simulates their diagenesis and the resulting fluxes of inorganic substances (ammonium, nitrate, phosphate and silica) and sediment oxygen demand back to the water column. The coupling of the sediment process model with the water quality model not only enhances the model's predictive capability of water quality parameters but also enables it to simulate the long-term changes in water quality conditions in response to changes in nutrient loads. The EFDC model also has a toxicant model that can used to simulate metals if desired. The output of the hydrodynamic and sediment model are linked to the toxicant model to simulate metals.

Application of EFDC will require segmentation of the reservoir into multiple grid cells and definition of hydraulic characteristics and boundary conditions. A 3-dimensional representation is expected. Boundary conditions will include nonpoint source contributions from the watershed and point source contributions (defined by discharge monitoring report data identified during the data review process). Due to the inherent solutions of the water quality model, it will be necessary to convert the BOD from the point sources and the LSPC model to TOC. EFDC is a carbon-based water quality model, and therefore, the model simulates organic matter as carbon rather than BOD. This conversion will be based on an analysis of BOD-TOC ratios. An average ratio will be calculated from monitoring data for each watershed (since these ratios vary dramatically, particularly by landuse). The watershed loads simulated by LSPC are with respect to BOD, TN, TP, and TSS (although individual nitrogen and phosphorus components can be simulated explicitly, if deemed necessary). The EFDC model will be applied for a selected time period leading up to, during, and after critical conditions occur.

June 2003 7-6 Historical Data Review for Sam Rayburn Reservoir

8.0 Conclusions

Sam Rayburn Reservoir was placed on Texas’s 2000 and 2002 section 303(d) lists of impaired waterbodies for dissolved oxygen, pH, and aluminum impairments, therefore, these three parameters were analyzed for the reservoir. Any parameters that affect dissolved oxygen (i.e., nutrients and chlorophyll a) were also included in the analysis. Additional parameters were included in the analysis at the request of TCEQ to determine whether there are any other potential impairments of the reservoir. Data for the reservoir, its tributaries, and any potential pollutant sources were analyzed to better understand their influences on the reservoir. This section provides conclusion based on the data analysis.

8.1 Sam Rayburn Reservoir (Segment 0610 and 0615)

Dissolved Oxygen

The bulk of Sam Rayburn Reservoir generally meets the water quality criteria prescribed by TCEQ. Based on the data analysis for 1990 through 2002, a total of 3 exceedances were observed throughout the main body of the reservoir (segments 0610. 0610A, and 0615). Two exceedances were observed on Ayish Bayou (segment 0610A) and one exceedance in the main pool of the reservoir (segment 0610). There were no exceedances on Attoyac Bayou, but both Attoyac Bayou and Ayish Bayou showed very low hypolimnetic DO at times. Segment 0615 of the reservoir had several more DO exceedances than segment 0610, with 19 exceedances of the DO minimum and 6 exceedances of the DO average criteria. The low DO concentrations occurred mainly in August of 1996 , which was a wet month after a long drought. The reservoir was at its lowest levels in several years.

The reservoir stratifies in the summer months and has very low DO in the hypolimnion during stratification with concentrations often below 3.0 mg/L. The DO criteria only apply to the mixed layer, which can be very shallow at times. During summer stratification the DO concentrations are almost always low in the hypolimnion, however, very low DO concentrations are also observed in the epilimnion. The mixed layer (based on water temperature) often does not include the entire epilimnion, resulting in high dissolved oxygen concentrations at the surface of the reservoir, but severe oxygen deficits not far below the surface.

Segment 0615 is shallower than segment 0610 and has more direct impact from upstream tributaries (segment 0611 and its subsegments). Nutrient concentrations in the contributing tributaries were high throughout the watershed and were often associated with low DO concentrations in the reservoir. Likely sources of nutrients to the watershed include urbanization, pasture land, point sources, failing septic systems, and erosion. Nutrients can often be associated with high levels of erosion and some tributaries had high TSS observations.

Concentrations of phosphorus, nitrogen, chlorophyll a, and transparency were regularly higher than both the Texas nutrient screening levels and EPA’s nutrient reference criteria. Concentrations were high in both segment 0610 and 0615. The STORET nutrient data show especially high concentrations in the arms of the reservoir in August 1996. This was at a time of significant rainfall after a very long drought, allowing for build-up of nutrients in the watershed that were potentially washed off in very large amounts in August 1996. Several of the low DO

June 2003 8-1 Historical Data Review for Sam Rayburn Reservoir concentrations coincided with the high nutrient levels. Potential sources of nutrients to the arms of the reservoir include urbanization, pasture land, and poultry farms along Attoyac Bayou and Moss Creek. There are also several point sources that discharge to Mill Creek and Papermill Creek above segment 0615. While low DO does not appear to be a major problem at this time, there is potential for it to become a problem with the high nutrient concentrations observed at times in the reservoir and the surrounding watershed.

Metals

Dissolved aluminum, dissolved copper, dissolved lead, and dissolved zinc all showed some exceedances of the applicable criteria in the reservoir, but high detection limits made much of the data unusable. There were several exceedances of the 991 µg/L dissolved aluminum criterion. The detection limits for metals in the watershed will be reduced by ANRA and TCEQ for future sampling efforts to obtain data that can be compared to the criteria.

Bacteria

About eight percent of the bacteria samples exceeded the criteria for segment 0610. Most of the exceedances were observed on Ayish Bayou where potential bacteria sources include pasture land, the city of San Augustine at the headwaters, and failing septic systems.

There were many more exceedances of the bacteria criteria on segment 0615 (40 percent). The potential bacteria sources to segment 0615 include several point sources (schools and subdivisions) on Mill Creek and Papermill Creek, the City of Lufkin, the City of Nacogdoches, pasture land, and failing septic systems.

Other Constituents

There were not many exceedances of cloride, sulfate, and TDS in the reservoir, but there were many more exceedances in segment 0615 than 0610.

8.2 Tributaries to Sam Rayburn Reservoir (Segment 0611 and 0612)

The tributaries draining to the Sam Rayburn Reservoir were evaluated to identify spatial influences on the problems in the reservoir.

Dissolved Oxygen

There were not many DO exceedances on segment 0611 and 0612. There were 3 exceedances on segment 0611; one each on La Nana Bayou, Ragsdale Creek at Canada Street, and Caney Creek southeast of the City of Troup. There were no exceedances on segment 0612 (Attoyac Bayou).

Nutrient concentrations were high throughout the watershed. Mud Creek and West Mud Creek, below the City of Tyler, had several observations of high nutrient data. Likely sources of nutrients to the watershed include urbanization, pasture land, point sources, failing septic systems, and erosion. Nutrients can often be associated with high levels of erosion. The highest TSS observations in the watershed were observed at Mud Creek, Attoyac Bayou, and the Angelina

June 2003 8-2 Historical Data Review for Sam Rayburn Reservoir

River below La Nana Bayou. High nutrient concentrations appear to be associated with the low DO levels in the reservoir. It is likely that controlling sources of sediment and nutrients to the reservoir would have an affect on the DO concentrations.

Metals

There were exceedances of metals criteria in several of the streams in segment 0611 and 0612. These streams include Mud Creek, the Angelina River, Attoyac Bayou, West Mud Creek, and East Fork Angelina River. Potential sources of metals in the watershed include point sources as well as natural sources. Metals may exist in naturally high levels in the local soils, thereby being washed into the waterbodies with erosion of the soil. Further research into the background levels of metals in soils in the Sam Rayburn Reservoir watershed needs to be conducted. This will help ascertain whether the high metals are anthropogenic or natural.

Bacteria

There were several exceedances of the bacteria criteria on La Nana Bayou and Attoyac Bayou. The Angelina River, East Fork Angelina River, and Mud Creek also showed some bacteria exceedances. The bacteria sources in the watershed are most likely nonpoint and point sources because a strong correlation between streamflow and bacteria concentrations was not identified for any of the stations. It is likely that point sources contribute bacteria to the waterbodies under all flow conditions and nonpoint sources contribute bacteria in washoff to the waterbodies during storm events. Several of the streams in the watershed either flow through cities or have cities at their headwaters that can be major sources of bacteria. Areas of pasture and poultry operations are also potential bacteria sources to the watershed.

June 2003 8-3 Historical Data Review for Sam Rayburn Reservoir

9.0 References

Angelina & Neches River Authority. 2002. Upper Neches Basin Highlights Report. ANRA Clean Rivers Program. 21 p.

Bicknell, B.R., J.C. Imhoff, J.L. Kittle, A.S. Donigian, and R.C. Johanson. 1996. Hydrological Simulation Program – FORTRAN (HSPF): User’s Manual for Release 11. Environmental Research Laboratory, Office of Research & Development, U.S. Environmental Protection Agency, Athens, GA.

Blumberg, A.F. and G.L. Mellor. 1987. A description of a three-dimensional coastal ocean circulation model. In: Three-dimensional coastal and ocean models, coastal and estuarine science, Vol. 4. American Geographical Union, pp. 1-19.

Blair, F. W. 1950. The Biotic Provinces of Texas. Tex. J. Sci. 93-117.

Cerco, C.F. and Cole, T.M. 1994. Three-dimensional eutrophication model of Chesapeake Bay: Volume 1, main report. Technical Report EL-94-4, US Army Engineer Waterways Experiment Station, Vicksburg, MS.

Dallas Morning News. 1997. Texas Almanac. Texas A&M Consortium, College Sattion, Texas.

Dice, L. R. 1943. The Biotic Provinces of North America. Univ. Mich. Press, Ann Arbor: 1-78.

DiToro, D.M. and Fitzpatrick, J.J. 1993. Chesapeake Bay Sediment Flux Model. Contract Report EL-93-2, US Army Engineer Waterways Experiment Station, Vicksburg, MS.

El Hage, A. and D. W. Moulton. 1998. Evaluation of Selected natural Resources in Angelina, Cherokee, Gregg, Nacogdoches, Rusk , and Smith Counties, Texas. Texas Parks and Wildlife, Resource Protection Division: Water Resources Team. 53 p.

Hamrick, J.M. 1992(a). A Three-dimensional Environmental Fluid Dynamics Computer Code: Theoretical and Computational Aspects. The College of William and Mary, Virginia Institute of Marine Science. Special report 317, 63 pp.

Hamrick, John M. 1996. User’s Manual for the Environmental Fluid Dynamics Computer Code. Special Report No. 331 in Applied Marine Science and Ocean Engineering. Department of Physical Sciences, School of Marine Science, Virginia Institute of Marine Science, The College of William and Mary, Gloucester Point, VA.

MacDonald, D.D., C.G. Ingersoll, and T.A Berger. 2000. Development and Evaluation of Concensus-Based Quality Guidelines for Freshwater Ecosystems. Arch. Environ. Contam. Toxicol. 39: 20-31.

June 2003 9-1 Historical Data Review for Sam Rayburn Reservoir

McKeon, T.J. and J.J. Segna. 1997. Selection Criteria for Mathematical Models used in Exposure Assessments: Surface Water Models. EPA/600/8-87/042. Exposure Assessment Group, Office of Health and Environmental Assessment, U.S. Environmental Protection Agency, Washington, DC.

NASS (National Agricultural Statistics Service). 1997. [www.nass.usds.gov/census97/highlights/tx]

NCDC. 2001. Long Term Drought Severity Index. National Climatic Data Center. Ftp://ftp.ncdc.noaa.gov/pub/data/cirs/

Park, K., A. Kuo, J. Shen, and J. Hamrick. 1995 (rev. by Tetra Tech, Inc. 2000). A Three- dimensional Hydrodynamic-Eutrophication Model (HEM-3D): Description of Water Quality and Sediment Process Submodels (EFDC Water Quality Model). Special Report No. 327 in Applied Marine Science and Ocean Engineering. Department of Physical Sciences, School of Marine Science, Virginia Institute of Marine Science, The College of William and Mary, Gloucester Point, VA.

Shoemaker, L., M. Lahlou, M. Bryer, D. Kumar, and K. Kratt. 1997. Compendium of Tools for Watershed Assessment and TMDL Development. EPA 841-B-97-006. Office of Water, U.S. Environmental Protection Agency, Washington, DC.

TCEQ. 2003. Procedures to Implement the Texas Surface Water Quality Standards. Water Quality Division, Texas Commission on Environmental Quality. Austin, TX.

TCEQ. 2003. Sam Rayburn Reservoir Metals Study. 68 p. (Draft)

TCEQ. 2000. Texas Surface Water Quality Standards. Texas Administrative Code (TAC), Title 30, Chapter 307.

TCEQ. 2002. Texas Surface Water Quality—What is it and How is it Measured?

The Texas State Historical Association. 2002. The Handbook of Texas Online. Sam Rayburn Reservoir

Tharp, B. C. 1939. The Vegitation East of 98th Meridian. Univ. Tex. Bull. 2606: 100 pp.

TNRCC. 1999. Developing Total Maximum Daily Load Projects in Texas: A Guide for Lead Organizations. Texas Natural Resource Conservation Commission, Austin, Texas.

TNRCC. 2002. Guidance for Assessing Texas Surface and Finished Drinking Water Quality Data, 2002. Texas Natural Resource Conservation Commission. Office of Compliance and Enforcement, Monitoring Operations Division, Surface Water Quality Monitoring Program. Austin, Texas.

USACE. 2003. Sam Rayburn Reservoir General information. U.S. Army Corps of Engineers Fort Worth District. Http://swf67.swf-wc.usace.army.mil/samray/ accessed 2003.

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USACE. 1998. Sam Rayburn Reservoir Water Quality Report. U.S. Army Corps of Engineers, Fort Worth Distric, 32 p.

USEPA. 2000. Ambient Water Quality Criteria Recommendations; Lakes and Reservoirs in Nutrient Ecoregion IX. Office of Water. Washington, DC.

USEPA. 2000. Ambient Water Quality Criteria Recommendations; Rivers and Streams in Nutrient Ecoregion IX. Office of Water. Washington, DC.

USEPA. 1996. Calculation and Evaluation of Sediment Effects Concentrations for the Amphipod Hyalella azteca and the Midge Chironomus riparius. EPA 905-R96-008.

USEPA. 2002. Fact Sheet: Ecoregional Nutrient Criteria. Office of Water.

USEPA. 1977. Report on Sam Rayburn Reservoir, Angelina, Jasper, Nacogdoches, Sabine and San Augustine Counties, Texas. National Eutrophication Survey. EPA Region VI Working Paper No. 657.

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